🔥 Complete Class 12 Chemistry Formulas Chapter-wise | All Reactions, Tricks & Notes for Boards & NEET/JEE

🔰 **Complete Class 12 Chemistry Formulas – Chapter-wise with Reactions, Tricks & Short Notes**

📚 Are you a Class 12 student preparing for CBSE, AHSEC, or any competitive exam like NEET, JEE, CUET, etc.?

Then this post is your ultimate one-stop solution!

We have compiled **all chapters of Class 12 Chemistry** with complete **formulas, reactions, tricks, and quick revision notes** in one place — all presented in **simple code format**, perfect for fast memorization and blogging. From **Solid State** to **Chemistry in Everyday Life**, every formula is arranged chapter-wise for easy navigation and maximum clarity.

Whether you’re revising for board exams or building a strong base for competitive entrance tests, these formulas will help you save time, score full marks, and build conceptual confidence.

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💥 **What You’ll Get in This Post:**

- ✅ All 15 Chapters of Class 12 Chemistry (Physical, Inorganic & Organic)

- ✅ Formulas + Mechanisms + Short Tricks

- ✅ Reactions with Equations & Examples

- ✅ Distinguishing Tests & Important Keywords

- ✅ Ready for Direct Use in Blogger or HTML post (code format)

🧪 **List of Covered Chapters:**

1. Solid State

2. Solutions

3. Electrochemistry

4. Chemical Kinetics

5. Surface Chemistry

6. The p-Block Elements

7. The d- and f-Block Elements

8. Coordination Compounds

9. Haloalkanes and Haloarenes

10. Alcohols, Phenols and Ethers

11. Aldehydes, Ketones and Carboxylic Acids

12. Amines

13. Biomolecules

14. Polymers

15. Chemistry in Everyday Life

📌 Bookmark this page, share it with your friends, and master Chemistry with confidence.

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🔹 CHAPTER 1: SOLUTIONS – Important Formulas

📘 Basic Concepts:

- Solution = Solute + Solvent

- Homogeneous mixture of two or more substances

📌 Mass Percentage (% w/w):

= (Mass of solute / Mass of solution) × 100

📌 Volume Percentage (% v/v):

= (Volume of solute / Volume of solution) × 100

📌 Mole Fraction (X):

= moles of component / total moles of all components

= n₁ / (n₁ + n₂)

📌 Molarity (M):

= (Moles of solute) / (Volume of solution in Litres)

📌 Molality (m):

= (Moles of solute) / (Mass of solvent in kg)

📌 Normality (N):

= (Gram equivalent of solute) / (Volume of solution in litres)

📌 Parts per million (ppm):

= (Mass of solute / Mass of solution) × 10⁶

📌 Mole Fraction Relation:

XA + XB = 1

📌 Dilution Formula:

M₁V₁ = M₂V₂

🔹 Raoult’s Law:

P_A = X_A × P⁰_A

P_total = P_A + P_B = X_A·P⁰_A + X_B·P⁰_B

🔹 Colligative Properties:

1. Relative Lowering of Vapour Pressure:

(ΔP / P⁰) = X_solute

2. Elevation in Boiling Point:

ΔT_b = K_b × m

3. Depression in Freezing Point:

ΔT_f = K_f × m

4. Osmotic Pressure:

π = C × R × T

= (n/V) × R × T

🔹 van’t Hoff Factor (i):

i = observed colligative property / calculated colligative property

🔹 Abnormal Molar Mass:

Corrected molar mass = (normal colligative formula) / i

🧠 Notes:

✔ Molarity changes with temperature

✔ Molality is temperature independent

✔ Colligative properties depend on number of particles, not nature

✔ Electrolytes dissociate → i > 1

✔ Associating compounds → i < 1

📌 Units to Remember:

- Molarity: mol/L

- Molality: mol/kg

- R: 0.0821 L·atm/mol·K or 8.314 J/mol·K

🔹 CHAPTER 2: ELECTROCHEMISTRY – Important Formulas

📘 Basic Terms:

- Electrochemistry deals with the relation between electricity and chemical reactions.

- Two main types of cells:

1. Electrolytic Cell – Uses electrical energy to drive a chemical reaction.

2. Galvanic Cell (Voltaic Cell) – Produces electrical energy from a spontaneous redox reaction.

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📌 Ohm’s Law:

V = I × R

Where:

V = Voltage (Volts)

I = Current (Amperes)

R = Resistance (Ohms)

📌 Resistance of a conductor:

R = ρ × (l / A)

Where:

ρ = resistivity (ohm·m),

l = length (m),

A = area of cross-section (m²)

📌 Conductance (G):

G = 1 / R

Unit: Siemens (S)

📌 Specific Conductivity (κ or kappa):

κ = G × (l / A)

κ = 1 / ρ

Unit: S·m⁻¹ or S·cm⁻¹

📌 Molar Conductivity (Λₘ):

Λₘ = (κ × 1000) / C

Where:

C = concentration in mol/m³ or mol/L

Unit: S·cm²/mol

📌 Variation of Λₘ with dilution:

- For strong electrolytes: Increases slowly and approaches a limiting value (Λ°ₘ).

- For weak electrolytes: Increases sharply.

📌 Kohlrausch’s Law:

Λ°ₘ (AB) = Λ°ₘ (A⁺) + Λ°ₘ (B⁻)

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🔋 Electrochemical Cell Formulas:

📌 Cell Notation:

Zn | Zn²⁺ (1M) || Cu²⁺ (1M) | Cu

(Anode on left, cathode on right)

📌 EMF of the cell:

E°cell = E°cathode – E°anode

📌 Gibbs Free Energy:

ΔG° = –nFE°cell

Where:

n = number of electrons transferred

F = Faraday = 96500 C/mol

📌 Nernst Equation:

E_cell = E°cell – (0.0591 / n) × log(Q)

Where Q = [products]/[reactants]

✔ For a general redox reaction:

aA + bB ⇌ cC + dD

Q = ([C]^c × [D]^d) / ([A]^a × [B]^b)

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📌 Faraday’s Laws of Electrolysis:

1. **First Law:**

Mass (m) ∝ Quantity of electricity (Q)

m = (Z × Q) = (Z × I × t)

Where:

Z = electrochemical equivalent

I = current (A), t = time (s)

2. **Second Law:**

When same current passed through different electrolytes,

mass deposited ∝ equivalent weight

📌 Equivalent weight:

E = (Molecular weight) / (n electrons involved)

📌 Charge required for 1 mole of electron:

1 Faraday (F) = 96500 Coulombs

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🧠 Important Units and Constants:

- R = 8.314 J/mol·K

- F = 96500 C/mol

- 1 Volt = 1 Joule/Coulomb

- 1 ampere = 1 C/s

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📌 Conductivity Order (approx):

Strong electrolyte > Weak electrolyte > Nonelectrolyte

📌 Applications:

- Batteries (Lead-acid, Lithium-ion)

- Electroplating

- Fuel cells

- Corrosion (electrochemical process)

🔹 CHAPTER 3: CHEMICAL KINETICS – Important Formulas

📘 Introduction:

Chemical Kinetics deals with the **rate of chemical reactions** and the **factors** that affect them.

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📌 Average Rate of Reaction:

= (Change in concentration) / (Change in time)

Rate = –Δ[R]/Δt = +Δ[P]/Δt

Unit: mol L⁻¹ s⁻¹

📌 Instantaneous Rate:

Rate = –d[R]/dt = +d[P]/dt

👉 Derivative of concentration w.r.t. time.

📌 Rate Law (Rate Expression):

Rate = k[A]^x[B]^y

Where:

k = rate constant

x, y = order with respect to A and B

📌 Overall Order of Reaction:

= x + y

(It can be zero, fractional, or whole number)

📌 Units of Rate Constant (k):

Depends on overall order (n) of reaction:

k = (mol)¹⁻ⁿ · Lⁿ⁻¹ · s⁻¹

Examples:

- Zero Order: k = mol L⁻¹ s⁻¹

- First Order: k = s⁻¹

- Second Order: k = L mol⁻¹ s⁻¹

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📌 Integrated Rate Equations:

🔹 **Zero Order Reaction**:

Rate = k

[A] = [A]₀ – kt

t½ = [A]₀ / (2k)

🔹 **First Order Reaction**:

Rate = k[A]

ln([A]₀/[A]) = kt

k = (2.303 / t) × log([A]₀ / [A])

t½ = 0.693 / k

🧠 Half-life is independent of initial concentration.

🔹 **Second Order Reaction**:

Rate = k[A]²

1/[A] = 1/[A]₀ + kt

t½ = 1 / (k[A]₀)

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📌 Arrhenius Equation:

k = A · e^(–Ea / RT)

Where:

k = rate constant

A = frequency factor

Ea = activation energy

R = gas constant

T = temperature in Kelvin

📌 Logarithmic Form of Arrhenius Equation:

log k = log A – (Ea / 2.303RT)

📌 Two-Temperature Form:

log(k₂/k₁) = (Ea / 2.303R) × [(T₂ – T₁) / (T₁T₂)]

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🧠 Reaction Mechanism:

- A sequence of elementary steps

- **Rate-determining step** = slowest step of the mechanism

- Molecularity: number of molecules involved in an elementary step

📌 Molecularity ≠ Order

👉 Molecularity is always whole number, never zero or fractional.

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📌 Graphical Analysis:

- First Order: ln[A] vs time → straight line (–ve slope)

- Zero Order: [A] vs time → straight line

- Second Order: 1/[A] vs time → straight line

📌 Half-life Summary:

| Order | t½ formula | Depends on [A]₀? |

|-------|----------------------|------------------|

| 0 | [A]₀ / 2k | Yes |

| 1 | 0.693 / k | No |

| 2 | 1 / (k × [A]₀) | Yes |

📌 Activation Energy Unit:

Usually in J/mol or kJ/mol

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🧠 Tricks to Remember:

✔ Zero Order → constant rate

✔ First Order → radioactive decay, t½ = 0.693/k

✔ Increase in temperature → increases k exponentially

✔ Higher Ea → slower reaction

✔ Catalyst lowers activation energy

🔹 CHAPTER 4: SURFACE CHEMISTRY – Important Formulas & Concepts

📘 Introduction:

Surface chemistry deals with phenomena that occur at the surface or interface of two phases, especially **adsorption, catalysis**, and **colloids**.

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🔸 ADSORPTION

📌 Adsorption:

The accumulation of molecules on the surface of a solid or liquid.

📌 Types of Adsorption:

1. **Physisorption (Physical adsorption)**

- Weak van der Waals forces

- Low heat of adsorption (20–40 kJ/mol)

- Multilayer

- Reversible

2. **Chemisorption (Chemical adsorption)**

- Strong chemical bonds

- High heat of adsorption (80–240 kJ/mol)

- Monolayer

- Irreversible

📌 Freundlich Adsorption Isotherm:

\frac{x}{m} = k P^{1/n}

Where:

x = mass of gas adsorbed

m = mass of adsorbent

P = pressure

k, n = constants (n > 1)

🧠 log form:

\log\left(\frac{x}{m}\right) = \log k + \frac{1}{n} \log P

📌 Langmuir Adsorption Isotherm:

\theta = \frac{kP}{1 + kP}

Where:

- \( \theta \) = fraction of surface covered

- k = equilibrium constant

- P = pressure

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🔸 CATALYSIS

📌 Catalyst:

A substance that increases the rate of a reaction without itself undergoing any permanent chemical change.

📌 Types:

1. **Homogeneous Catalysis** – Catalyst in same phase

2. **Heterogeneous Catalysis** – Catalyst in different phase

📌 Characteristics of Catalyst:

- Effective in small quantity

- Does not initiate reaction

- Specific in nature

- Unchanged at the end of reaction

- Affected by promoters and poisons

📌 Examples:

- Haber Process: N₂ + 3H₂ → 2NH₃ (Fe catalyst)

- Contact Process: SO₂ + O₂ → SO₃ (V₂O₅ catalyst)

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🔸 COLLOIDS

📌 Colloid:

A heterogeneous system in which the dispersed phase particles (1–1000 nm) are spread throughout the dispersion medium.

📌 Types of Colloids (Based on Dispersion Phase & Medium):

|------------------|--------------------|------------------|----------------|

📌 Tyndall Effect:

Scattering of light by colloidal particles.

📌 Brownian Movement:

Random zig-zag motion of colloidal particles due to collisions.

📌 Electrophoresis:

Movement of colloidal particles under an electric field.

📌 Coagulation:

Removal of colloidal stability (precipitation of colloid)

📌 Hardy–Schulze Rule:

Greater the valency of the ion, greater is its power to coagulate colloid.

📌 Gold Number:

Minimum amount of protective colloid (in mg) required to prevent coagulation of 10 mL of gold sol by NaCl.

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🧠 Important Notes:

✔ Adsorption ≠ Absorption

✔ Physical Adsorption → low temp, weak bond

✔ Chemical Adsorption → high temp, strong bond

✔ Colloids are stable due to charge

✔ Lyophilic sols are more stable than lyophobic sols

🔹 CHAPTER 5: PRINCIPLES & PROCESSES OF ISOLATION OF ELEMENTS – Important Formulas & Concepts

📘 Introduction:

Metallurgy is the process of extraction of metals from their ores and refining them for use.

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🔸 IMPORTANT TERMS

📌 Mineral:

A naturally occurring substance containing metal, associated with impurities.

📌 Ore:

A mineral from which metal can be extracted economically.

📌 Gangue:

Impurities like sand, clay present in the ore.

📌 Flux:

A substance added to remove gangue by forming a fusible mass called slag.

📌 Slag:

Fusible product formed by reaction of flux with gangue.

\text{Gangue} + \text{Flux} → \text{Slag}

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🔸 IMPORTANT STEPS IN METALLURGY

1. **Concentration of Ore** (Removal of gangue)

- Hydraulic washing

- Magnetic separation

- Froth flotation (for sulphide ores)

2. **Calcination and Roasting**

- **Calcination** (in limited or no air):

\text{CaCO}_3 → \text{CaO} + \text{CO}_2

- **Roasting** (in excess air):

2ZnS + 3O₂ → 2ZnO + 2SO₂

3. **Reduction (Smelting):**

Metal oxides → metal by reduction using:

- Carbon (C)

- Aluminium (Al) – *Aluminothermic process*

Cr₂O₃ + 2Al → 2Cr + Al₂O₃

4. **Electrolytic Reduction:**

Used for highly reactive metals (Na, Mg, Al)

- Electrolysis of molten ore

5. **Refining (Purification):**

✔ Electrolytic refining:

Anode = impure metal

Cathode = pure metal

Electrolyte = metal salt solution

Example:

\text{Anode:} Cu → Cu²⁺ + 2e⁻

\text{Cathode:} Cu²⁺ + 2e⁻ → Cu

✔ Zone refining (for Si, Ge):

Based on differing solubility of impurities.

✔ Vapour phase refining:

- Mond’s Process (Ni):

Ni + 4CO → Ni(CO)₄ (g) → Ni + 4CO

- van Arkel process (Zr, Ti):

Zr + 2I₂ → ZrI₄ → Zr + 2I₂

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🔸 THERMODYNAMIC CONSIDERATIONS

📌 Gibbs Free Energy:

\Delta G = \Delta H - T\Delta S

If ΔG < 0 → reaction is spontaneous

📌 Ellingham Diagram:

Graph of ΔG° vs Temperature for reduction reactions

✔ Lower the line on the diagram → more stable the oxide

✔ A metal can reduce another’s oxide if its line lies below

📌 Feasibility of Reduction:

A metal (M₁) can reduce the oxide of another metal (M₂O) if:

\Delta G^\circ_{\text{M₁ → M₁O}} < \Delta G^\circ_{\text{M₂ → M₂O}}

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🔸 IMPORTANT FORMULAS

📌 % Purity of metal in ore:

\% \text{Purity} = \left( \frac{\text{Mass of pure metal}}{\text{Mass of ore sample}} \right) × 100

📌 Mass of metal extracted:

\text{Mass} = \text{Number of moles} × \text{Molar mass}

📌 Faraday’s Law (for electrolytic reduction):

\text{w} = \frac{E \cdot I \cdot t}{96500}

Where:

w = mass deposited

E = equivalent weight

I = current (A)

t = time (s)

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🧠 Quick Summary:

✔ Sulphide ores → Roasting

✔ Carbonates → Calcination

✔ Highly reactive metals → Electrolysis

✔ Less reactive metals → Reduction by C or CO

✔ Very reactive metals → Electrolysis of molten salts

🔹 CHAPTER 6: THE p-BLOCK ELEMENTS – Key Concepts, Trends & Reactions

📘 Introduction:

- Group 15 to Group 18 elements are part of the p-block in Class 12.

- Includes: N, P, As, Sb, Bi (Group 15), O, S, Se, Te, Po (Group 16), F, Cl, Br, I (Group 17 – Halogens), and Noble Gases (Group 18).

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🔸 GROUP 15 ELEMENTS (NITROGEN FAMILY)

📌 General Configuration: ns² np³

📌 Oxidation States: –3, +3, +5

📌 Allotropy:

- P → White, red, black phosphorus

📌 Key Compounds:

1. **Ammonia (NH₃):**

Structure: Trigonal pyramidal

H-bonding, high boiling point

2. **Nitric Acid (HNO₃):**

- Strong oxidizing agent

- Reaction with copper:

Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O

3. **Oxides of Nitrogen:**

N₂O, NO, NO₂, N₂O₃, N₂O₅

- Acidic character increases with oxidation number

📌 Anomalous Behaviour of Nitrogen:

- Small size, high electronegativity

- Ability to form pπ–pπ bonds

- Forms triple bond in N₂

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🔸 GROUP 16 ELEMENTS (OXYGEN FAMILY)

📌 General Configuration: ns² np⁴

📌 Oxidation States: –2, +2, +4, +6

📌 Oxygen:

- Allotropy: O₂ (dioxygen), O₃ (ozone)

- O₂ + O → O₃ (ozone formation)

- Ozone is powerful oxidant

📌 Sulphur Compounds:

1. **Sulphur Dioxide (SO₂):**

S + O₂ → SO₂

SO₂ + H₂O → H₂SO₃ (Sulphurous acid)

2. **Sulphuric Acid (H₂SO₄):**

- Dibasic, strong acid

- Acts as dehydrating & oxidizing agent

📌 Oxoacids of Sulphur:

- H₂SO₃, H₂SO₄, H₂S₂O₇ etc.

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🔸 GROUP 17 ELEMENTS (HALOGENS)

📌 General Configuration: ns² np⁵

📌 Highly reactive non-metals

📌 Oxidation States: –1, +1, +3, +5, +7

📌 Reactivity: F > Cl > Br > I

📌 Acidity of HX: HF < HCl < HBr < HI

📌 Key Reactions:

- Halogen + Alkali (Cold):

Cl₂ + 2NaOH → NaCl + NaOCl + H₂O

- Halogen + Alkali (Hot):

3Cl₂ + 6NaOH → 5NaCl + NaClO₃ + 3H₂O

📌 Interhalogen Compounds:

General Formula: AXₙ (n = 1, 3, 5, 7)

📌 Structure Examples:

- ClF₃ → T-shaped

- IF₇ → Pentagonal bipyramidal

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🔸 GROUP 18 ELEMENTS (NOBLE GASES)

📌 Configuration: ns² np⁶

📌 Monoatomic, inert

📌 Uses:

- He: balloons, cryogenics

- Ne: advertisement signs

- Ar: inert atmosphere in metallurgy

- Xe: lighting, compound formation

📌 Important Compounds:

- XeF₂, XeF₄, XeF₆ → Fluorides of Xenon

📌 Hybridization & Structure:

- XeF₂ → Linear (sp³d)

- XeF₄ → Square planar (sp³d²)

- XeF₆ → Distorted octahedral

📌 Key Reaction Example:

Xe + F₂ → XeF₂ (under high temp and pressure)

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🧠 Trends Summary Across p-Block:

| Property | Top to Bottom | Left to Right (Group 15 → 18) |

|------------------|---------------|-------------------------------|

| Atomic Radius | Increases | Decreases |

| Ionization Energy| Decreases | Increases |

| Electronegativity| Decreases | Increases |

| Reactivity | Variable | Non-metallic → Inert |

📌 Tips:

✔ F is most reactive non-metal

✔ N₂ is triple bonded, inert

✔ NH₃ is basic, pyramidal

✔ HNO₃, H₂SO₄ = strong oxidizing agents

✔ Noble gases form very few compounds (only Xe and Kr)

🔹 CHAPTER 7: THE d- AND f-BLOCK ELEMENTS – Key Formulas, Properties & Trends

📘 Introduction:

- d-Block → Transition Elements (Groups 3–12)

- f-Block → Inner-Transition Elements (Lanthanides and Actinides)

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🔸 d-BLOCK ELEMENTS

📌 General Configuration:

(n–1)d¹⁻¹⁰ ns¹⁻²

📌 Characteristics of Transition Elements:

✔ Variable oxidation states

✔ Formation of colored ions

✔ Catalytic properties

✔ Formation of complex compounds

✔ High melting and boiling points

✔ Paramagnetic due to unpaired d-electrons

📌 Common Oxidation States:

- Sc → +3

- Ti → +2, +3, +4

- Fe → +2, +3

- Cu → +1, +2

- Mn → +2 to +7 (maximum range)

📌 Magnetic Moment Formula:

\mu = \sqrt{n(n+2)} \text{ BM}

Where:

n = number of unpaired electrons

BM = Bohr Magneton

📌 Color of Compounds:

Due to **d–d transitions** of unpaired electrons in the presence of ligands (Crystal Field Theory)

📌 Catalytic Properties:

Due to variable oxidation states and surface activity

e.g., Fe in Haber Process, V₂O₅ in Contact Process

📌 Alloy Formation:

- Cu, Ni, Zn form strong alloys due to similar atomic size

📌 Interstitial Compounds:

- Transition metals form compounds with small atoms (H, B, C, N)

→ e.g., Fe₃C (cementite)

📌 Complex Formation:

- Due to small size, high charge, and availability of d-orbitals

→ Form coordination compounds like [Fe(CN)₆]³⁻

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🔸 f-BLOCK ELEMENTS

📌 General Configuration:

- Lanthanides: [Xe] 4f¹–¹⁴ 5d⁰⁻¹ 6s²

- Actinides: [Rn] 5f¹–¹⁴ 6d⁰⁻¹ 7s²

📌 Characteristics of Lanthanides:

✔ +3 oxidation state is most common

✔ Slight variation in atomic size = **Lanthanide contraction**

✔ Form colored ions

✔ Show paramagnetism

📌 Lanthanide Contraction:

- Steady decrease in atomic/ionic radii across the series due to poor shielding of 4f electrons

👉 Results in:

– Similarity between Zr & Hf, Nb & Ta

📌 Consequences:

- Poor separation of lanthanides

- Higher density & hardness of later members

📌 Actinides:

✔ Radioactive

✔ Variable oxidation states (+3 to +6)

✔ Greater tendency to form complexes than lanthanides

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🔸 TRENDS IN PROPERTIES

📌 Melting & Boiling Point:

- High due to strong metallic bonding

- Irregular trends due to electron configurations

📌 Ionization Enthalpy:

- Gradually increases across a series

- Lower than s- and p-block due to d-orbitals

📌 Atomic & Ionic Radii:

- Decrease across period due to increasing nuclear charge

- f-block → **Lanthanide contraction** observed

📌 Color and Magnetism:

- Due to presence of unpaired electrons in d- or f-orbitals

📌 Redox Reactions:

- Transition metals can exist in multiple oxidation states

- Mn²⁺ → colorless, Mn⁷⁺ (in KMnO₄) → purple

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📌 Important Compounds & Uses:

- KMnO₄ (Potassium permanganate) – Oxidizing agent

MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O

- K₂Cr₂O₇ (Potassium dichromate) – Oxidizing agent

Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O

📌 Tests:

- KMnO₄ and K₂Cr₂O₇ used in redox titrations

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🧠 Summary Table:

|---------|--------------------|---------------|------------|

| Sc | +3 | Colorless | Diamagnetic |

| Ti | +3, +4 | Violet, colorless | Paramagnetic |

| Fe | +2, +3 | Green, yellow | Paramagnetic |

| Cu | +1, +2 | Colorless, blue | Paramagnetic |

| Mn | +2 to +7 | Pink to purple | Paramagnetic |

| Zn | +2 | Colorless | Diamagnetic |

📌 f-block: All show complex behaviors, mainly studied qualitatively.

🔹 CHAPTER 8: COORDINATION COMPOUNDS – Important Terms, Formulas & Structures

📘 Introduction:

Coordination compounds are formed by the **donation of lone pairs** from ligands to a central metal atom or ion, forming coordinate bonds.

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🔸 KEY TERMS

📌 Coordination Entity:

[Co(NH₃)₆]³⁺ → Co³⁺ = central metal, NH₃ = ligands

📌 Ligand:

Ion or molecule that donates a pair of electrons to the metal.

- **Monodentate**: NH₃, Cl⁻, CN⁻

- **Bidentate**: C₂O₄²⁻ (oxalate), ethylenediamine (en)

- **Polydentate**: EDTA⁴⁻ (hexadentate)

📌 Coordination Number:

Number of ligand donor atoms bonded to central metal.

e.g., [Fe(CN)₆]³⁻ → C.N. = 6

📌 Coordination Sphere:

Part enclosed in brackets [ ] → acts as a single unit

📌 Counter Ion:

Ion outside the coordination sphere, balancing the charge

📌 Chelation:

When a multidentate ligand forms a ring structure with metal.

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🔸 NOMENCLATURE RULES

📌 Naming:

1. Name ligands first (alphabetical order), then metal

2. Anionic ligands end in -o (Cl⁻ = chloro, CN⁻ = cyano)

3. Neutral ligands – special names: NH₃ = ammine, H₂O = aqua

4. Metal in cation → usual name

Metal in anion → ends with -ate (Ferrate, Cuprate)

📌 Examples:

- [Cr(NH₃)₄Cl₂]Cl → Tetraamminedichlorochromium(III) chloride

- K₄[Fe(CN)₆] → Potassium hexacyanoferrate(II)

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🔸 ISOMERISM

📌 Structural Isomerism:

- **Ionization Isomerism**: exchange of ligand and counter ion

e.g., [Co(NH₃)₅Br]SO₄ ↔ [Co(NH₃)₅SO₄]Br

- **Hydrate Isomerism**: Water inside vs outside the sphere

e.g., [Cr(H₂O)₆]Cl₃, [Cr(H₂O)₅Cl]Cl₂·H₂O

📌 Stereoisomerism:

- **Geometrical**: cis/trans in square planar & octahedral

e.g., [Pt(NH₃)₂Cl₂]

- **Optical**: non-superimposable mirror images

e.g., [Co(en)₃]³⁺ → shows optical isomerism

────────────────────────

🔸 BONDING THEORIES

📌 Werner’s Theory:

- Primary valency = ionic

- Secondary valency = coordinate bonds

📌 Valence Bond Theory (VBT):

- Explains hybridization and geometry

- Inner orbital complex → low spin (d²sp³)

- Outer orbital complex → high spin (sp³d²)

📌 Examples:

- [Fe(CN)₆]⁴⁻ → d²sp³ (low spin, diamagnetic)

- [FeF₆]³⁻ → sp³d² (high spin, paramagnetic)

📌 Limitations of VBT:

❌ Doesn’t explain color, spectra, or exact magnetic moment

📌 Crystal Field Theory (CFT):

- Electrostatic interaction between metal ion & ligand

- d-orbitals split in ligand field

🔸 Octahedral Field Splitting:

- d-orbitals split into two groups:

t₂g (lower energy): d_xy, d_xz, d_yz

e_g (higher energy): d_z², d_x²–y²

📌 Crystal Field Splitting Energy:

Δ₀ = Energy difference between e_g and t₂g levels

📌 Factors affecting Δ₀:

- Nature of metal ion

- Oxidation state

- Nature of ligand (Spectrochemical Series)

📌 Spectrochemical Series (increasing field strength):

I⁻ < Br⁻ < Cl⁻ < F⁻ < OH⁻ < H₂O < NH₃ < en < CN⁻ < CO

📌 CFSE (Crystal Field Stabilization Energy):

= (0.4 × no. of electrons in t₂g) – (0.6 × no. in e_g) × Δ₀

────────────────────────

🔸 MAGNETIC MOMENT

📌 Magnetic Moment Formula:

\mu = \sqrt{n(n+2)} \text{ BM}

Where n = number of unpaired electrons

📌 Diamagnetic = all electrons paired

📌 Paramagnetic = unpaired electrons

────────────────────────

🔸 IMPORTANT EXAMPLES

|---------------------|---------------|--------------|------------------|

| [FeF₆]³⁻ | sp³d² | Octahedral | Paramagnetic |

📌 EDTA⁴⁻: Hexadentate ligand used in water softening and metal detoxification.

📌 Werner Complex Example:

[Co(NH₃)₆]Cl₃ → 3 Cl⁻ ions outside, total ions in solution = 4

🔹 CHAPTER 9: HALOALKANES AND HALOARENES – Important Formulas, Reactions & Concepts

📘 Introduction:

- **Haloalkanes**: Alkyl group + halogen (R–X)

- **Haloarenes**: Aryl group + halogen (Ar–X)

────────────────────────

🔸 CLASSIFICATION

📌 Based on number of halogen atoms:

- Monohalo: CH₃Cl (methyl chloride)

- Dihalo: CH₂Cl₂ (methylene chloride)

- Trihalo: CHCl₃ (chloroform)

- Tetrahalo: CCl₄ (carbon tetrachloride)

📌 Based on the type of carbon:

- **Primary** (1°): Halogen attached to 1° carbon (CH₃CH₂Cl)

- **Secondary** (2°): CH₃CHClCH₃

- **Tertiary** (3°): (CH₃)₃CCl

────────────────────────

🔸 PREPARATION OF HALOALKANES

1. **From Alcohols:**

- ROH + HX → R–X + H₂O (with ZnCl₂ as catalyst)

2. **From Alkanes:**

- Free radical halogenation

CH₄ + Cl₂ → CH₃Cl + HCl (in sunlight)

3. **From Alkenes:**

- Addition of HX or X₂

CH₂=CH₂ + HBr → CH₃CH₂Br

4. **Finkelstein Reaction:**

R–Cl + NaI → R–I + NaCl (in acetone)

5. **Swarts Reaction:**

R–Cl + AgF → R–F + AgCl

────────────────────────

🔸 PHYSICAL PROPERTIES

📌 Boiling Point:

- Increases with molar mass and number of halogens

- For isomers: straight-chain > branched

📌 Solubility:

- Insoluble in water

- Soluble in organic solvents

📌 Density Order:

Iodo > Bromo > Chloro > Fluoro compounds

────────────────────────

🔸 CHEMICAL REACTIONS

📌 Nucleophilic Substitution:

1. **SN1 Mechanism** (Unimolecular):

- 2 steps:

Step 1: R–X → R⁺ + X⁻ (slow)

Step 2: R⁺ + Nu⁻ → R–Nu (fast)

- Favoured by: 3° alkyl halide

- Rate ∝ [R–X]

- Racemization occurs

2. **SN2 Mechanism** (Bimolecular):

- 1 step (concerted):

R–X + Nu⁻ → R–Nu + X⁻

- Favoured by: 1° alkyl halide

- Rate ∝ [R–X][Nu⁻]

- Inversion of configuration (Walden inversion)

📌 Elimination Reaction (dehydrohalogenation):

R–CH₂–CH₂–X + alc. KOH → R–CH=CH₂ + HX

- Zaitsev's Rule: More substituted alkene is major product

📌 Reaction with Metals:

- **Wurtz Reaction:**

2R–X + 2Na → R–R + 2NaX (in dry ether)

- **Grignard Reagent Formation:**

R–X + Mg → R–MgX (in dry ether)

────────────────────────

🔸 HALOARENES (AROMATIC HALIDES)

📌 Reactivity:

- Less reactive than haloalkanes toward nucleophilic substitution

- Due to resonance and partial double bond character in C–X bond

📌 Electrophilic Substitution:

- Halogen is **ortho/para directing**, deactivating group

- Common reactions:

→ Nitration: Ar–X + HNO₃/H₂SO₄ → NO₂–Ar–X

→ Sulphonation: Ar–X + H₂SO₄ → SO₃H–Ar–X

📌 Nucleophilic Substitution in Haloarenes:

- Needs strong conditions

- Mechanism: Elimination–Addition via **benzyne intermediate**

Example:

C₆H₅Cl + NaOH → C₆H₅OH (at 623K and 300 atm)

────────────────────────

🔸 ENVIRONMENTAL EFFECTS

📌 Chloroform (CHCl₃):

- Anaesthetic, reacts with air to form phosgene (COCl₂) – toxic

📌 CFCs (e.g., Freon-12: CCl₂F₂):

- Used as refrigerants

- Cause ozone layer depletion

────────────────────────

🧠 QUICK REVISION:

✔ SN1: 3° halides, polar solvents, racemization

✔ SN2: 1° halides, strong nucleophile, inversion

✔ Haloarenes: Show electrophilic substitution, not SN1/SN2

✔ Aryl halides resist nucleophilic substitution

✔ Wurtz reaction → alkanes

✔ Grignard reagents → versatile in organic synthesis

📌 Order of reactivity:

R–I > R–Br > R–Cl > R–F

Aryl halides < Alkyl halides (for substitution)

🔹 CHAPTER 10: ALCOHOLS, PHENOLS AND ETHERS – Key Reactions, Formulas & Concepts

📘 INTRODUCTION:

📌 Alcohols: Compounds with –OH group attached to alkyl chain (R–OH)

📌 Phenols: –OH group attached to aromatic ring (Ar–OH)

📌 Ethers: Compounds with R–O–R′ structure (alkyl or aryl)

────────────────────────

🔸 CLASSIFICATION

📌 Alcohols:

- 1° (Primary): –OH on 1° carbon (CH₃CH₂OH)

- 2° (Secondary): CH₃–CHOH–CH₃

- 3° (Tertiary): (CH₃)₃COH

📌 Phenols:

- Monohydric: C₆H₅OH

- Dihydric: Catechol, Resorcinol

- Trihydric: Pyrogallol

📌 Ethers:

- Symmetrical: CH₃–O–CH₃

- Unsymmetrical: CH₃–O–C₂H₅

────────────────────────

🔸 PREPARATION OF ALCOHOLS

1. **From Alkenes:**

- Hydration:

CH₂=CH₂ + H₂O \xrightarrow{H⁺} CH₃CH₂OH

- Hydroboration–Oxidation:

CH₂=CH₂ \xrightarrow{BH₃, H₂O₂/OH⁻} CH₃CH₂OH

→ Anti-Markovnikov addition

2. **From Carbonyl Compounds:**

- Reduction:

RCHO + H₂ → RCH₂OH

RCOR′ + H₂ → RCH(OH)R′

3. **From Grignard Reagents:**

- With aldehydes/ketones:

R–MgX + R′CHO → R′CH(OH)R

────────────────────────

🔸 PREPARATION OF PHENOLS

1. **From Benzene Sulphonic Acid:**

C₆H₅SO₃H + NaOH → C₆H₅OH + Na₂SO₃

2. **From Diazonium Salts:**

C₆H₅N₂⁺Cl⁻ + H₂O → C₆H₅OH + N₂ + HCl

────────────────────────

🔸 PREPARATION OF ETHERS

1. **Williamson’s Synthesis:**

R–X + R′–ONa → R–O–R′ + NaX

(Best for unsymmetrical ethers)

────────────────────────

🔸 PHYSICAL PROPERTIES

📌 Boiling Point Order:

Alcohols > Phenols > Ethers

→ Due to hydrogen bonding

📌 Solubility:

- Alcohols and phenols: soluble in water (small chains)

- Ethers: less soluble, no H-bonding with themselves

────────────────────────

🔸 CHEMICAL REACTIONS

📌 Reactions of Alcohols:

1. **With HX:**

R–OH + HBr → R–Br + H₂O

Order of reactivity: 3° > 2° > 1°

2. **Dehydration (E1 mechanism):**

CH₃CH₂OH \xrightarrow{conc. H₂SO₄, 443K} CH₂=CH₂ + H₂O

3. **Oxidation:**

- 1° Alcohol → Aldehyde → Acid

- 2° Alcohol → Ketone

- 3° Alcohol → No oxidation

📌 Reactions of Phenols:

1. **Electrophilic Substitution:**

- Nitration:

C₆H₅OH + HNO₃ → o- & p-nitrophenol

- Bromination:

C₆H₅OH + Br₂ → 2,4,6-tribromophenol

2. **Reaction with NaOH:**

C₆H₅OH + NaOH → C₆H₅O⁻Na⁺ + H₂O

3. **Reimer-Tiemann Reaction:**

C₆H₅OH + CHCl₃ + NaOH → o-Hydroxybenzaldehyde

📌 Reactions of Ethers:

1. **With Strong Acids (HI, HBr):**

R–O–R′ + HI → R–I + R′–OH

SN1 or SN2 depending on structure

2. **Electrophilic Substitution in Aromatic Ethers:**

- Anisole (C₆H₅OCH₃) → ortho/para substitution

────────────────────────

🔸 TESTS TO DISTINGUISH:

✔ Lucas Test (HCl + ZnCl₂):

- 3° Alcohol → immediate turbidity

- 2° → slow

- 1° → no turbidity

✔ FeCl₃ Test:

- Phenol gives violet color

────────────────────────

🧠 QUICK RECAP:

✔ Alcohols: H-bonding, dehydration to alkene, oxidizable

✔ Phenols: More acidic, undergo EAS, form salts

✔ Ethers: Low BP, cleavage with acids

✔ Williamson synthesis → best for unsymmetrical ethers

✔ Phenol → antiseptic, acidic in nature

📌 Order of acidity:

Phenol > Alcohol > Water > Alkyne > Alkene

📌 Order of reactivity (Lucas test):

3° > 2° > 1°

🔹 CHAPTER 11: ALDEHYDES, KETONES AND CARBOXYLIC ACIDS – Reactions, Formulas & Concepts

📘 INTRODUCTION:

📌 Aldehydes (–CHO):

General formula: R–CHO

e.g., Formaldehyde (HCHO), Acetaldehyde (CH₃CHO)

📌 Ketones (–CO–):

General formula: R–CO–R′

e.g., Acetone (CH₃COCH₃)

📌 Carboxylic Acids (–COOH):

General formula: R–COOH

e.g., Acetic acid (CH₃COOH), Benzoic acid (C₆H₅COOH)

────────────────────────

🔸 PREPARATION METHODS

📌 Aldehydes and Ketones:

1. **Oxidation of Alcohols:**

- 1° alcohol → Aldehyde

- 2° alcohol → Ketone

RCH₂OH \xrightarrow{[O]} RCHO

R₂CHOH \xrightarrow{[O]} R₂CO

2. **Ozonolysis of Alkenes:**

RCH=CHR′ + O₃ → RCHO + R′CHO or R′CO

3. **Hydration of Alkynes:**

RC≡CH + H₂O \xrightarrow{Hg²⁺, H⁺} R–CO–CH₃

📌 Carboxylic Acids:

1. **Oxidation of Aldehydes or Alcohols:**

RCHO \xrightarrow{[O]} RCOOH

RCH₂OH \xrightarrow{[O]} RCOOH

2. **Hydrolysis of Nitriles:**

R–CN + 2H₂O → R–COOH + NH₃

3. **From Grignard Reagents:**

R–MgX + CO₂ → RCOOMgX → RCOOH (on hydrolysis)

────────────────────────

🔸 PHYSICAL PROPERTIES

📌 Boiling Point Order:

Carboxylic Acid > Aldehyde/Ketone > Alcohol > Hydrocarbon

→ Due to H-bonding in acids

📌 Solubility:

- Lower members are water-soluble

- Solubility decreases with increase in chain length

────────────────────────

🔸 CHEMICAL REACTIONS

📌 **NUCLEOPHILIC ADDITION REACTIONS** (Aldehyde & Ketone):

1. **Addition of HCN:**

RCHO + HCN → RCH(OH)CN

2. **Addition of NaHSO₃:**

RCHO + NaHSO₃ → RCH(OH)SO₃Na

3. **Addition of Grignard Reagent:**

RCHO + RMgX → RCH(OH)R (alcohol)

4. **Reduction:**

- To Alcohols:

RCHO + H₂ → RCH₂OH

R₂CO + H₂ → R₂CHOH

- To Hydrocarbons:

RCHO \xrightarrow{Zn-Hg/HCl} RH (Clemmensen)

RCHO \xrightarrow{NH₂NH₂/KOH} RH (Wolff–Kishner)

📌 **OXIDATION:**

- Aldehyde → Acid

- Ketone → No change with mild oxidizers

📌 **Haloform Reaction:**

- Methyl ketone + Halogen (X₂) + Base → Carboxylate + CHX₃ (Haloform)

CH₃COCH₃ + 3Cl₂ + 4NaOH → CH₃COONa + CHCl₃ + 3NaCl + 3H₂O

📌 **Aldol Condensation:**

- 2 Aldehyde/Ketone molecules (with α-H) condense in base:

2CH₃CHO → CH₃CH(OH)CH₂CHO → CH₃CH=CHCHO (on heating)

📌 **Cannizzaro Reaction:**

- Aldehydes without α-H undergo disproportionation:

2HCHO + NaOH → HCOONa + CH₃OH

📌 **Cross Aldol & Mixed Reactions:**

- Two different carbonyl compounds used

────────────────────────

🔸 REACTIONS OF CARBOXYLIC ACIDS

1. **Acid–Base Reaction:**

RCOOH + NaOH → RCOONa + H₂O

2. **Reduction:**

RCOOH \xrightarrow{LiAlH₄} RCH₂OH

3. **Decarboxylation:**

RCOONa + NaOH → RH + Na₂CO₃

(soda lime)

4. **Esterification:**

RCOOH + R′OH \xrightarrow{H⁺} RCOOR′ + H₂O

5. **Substitution in Benzene Ring (Aromatic acids):**

- Ortho/Para directing group

- e.g., nitration, sulphonation

────────────────────────

🔸 TESTS TO IDENTIFY:

✔ Fehling’s Test:

- Aldehydes → red ppt

- Ketones → No reaction

✔ Tollen’s Test (Silver mirror):

- Aldehydes → silver mirror

- Ketones → No reaction

✔ Sodium bicarbonate test:

- Carboxylic acids → brisk effervescence of CO₂

────────────────────────

🧠 QUICK RECAP:

✔ Aldehydes = More reactive than ketones

✔ Nucleophilic addition = key for carbonyl compounds

✔ Acidic strength: Formic acid > Acetic acid > Propanoic acid

✔ Aldol reaction needs α-H

✔ Cannizzaro = no α-H

✔ Tollen's & Fehling's = tests for aldehydes

✔ Esters = formed by acid + alcohol (sweet smell)

📌 Order of reactivity (Carbonyls):

Formaldehyde > Aldehyde > Ketone

🔹 CHAPTER 12: AMINES – Structure, Classification, Reactions & Properties

📘 INTRODUCTION:

📌 Amines are derivatives of ammonia (NH₃) where one or more hydrogen atoms are replaced by alkyl or aryl groups.

📌 General formula: R–NH₂, R₂NH, R₃N

────────────────────────

🔸 CLASSIFICATION OF AMINES

📌 Based on number of alkyl/aryl groups attached to N:

- **Primary (1°) amine**: R–NH₂ (e.g., CH₃NH₂)

- **Secondary (2°) amine**: R₂NH (e.g., CH₃–NH–CH₃)

- **Tertiary (3°) amine**: R₃N (e.g., (CH₃)₃N)

📌 Based on nature of R group:

- **Aliphatic amines**: Alkyl group

- **Aromatic amines**: Aryl group (e.g., Aniline: C₆H₅NH₂)

────────────────────────

🔸 PREPARATION METHODS

📌 1. **Reduction of Nitro Compounds:**

R–NO₂ \xrightarrow{Sn/HCl \text{ or } H₂/Ni} R–NH₂

📌 2. **From Amides (Hofmann degradation):**

R–CONH₂ + Br₂ + 4NaOH → R–NH₂ + Na₂CO₃ + 2NaBr + 2H₂O

📌 3. **From Halides (Gabriel Phthalimide Synthesis):**

C₆H₄(CO)₂N–K + R–X → C₆H₄(CO)₂NR → R–NH₂ (on hydrolysis)

→ Only for **primary amines**

📌 4. **From Cyanides:**

R–CN \xrightarrow{H₂/Ni} R–CH₂–NH₂

📌 5. **Reductive Amination:**

R–CHO + NH₃ + H₂ → R–CH₂–NH₂

────────────────────────

🔸 PHYSICAL PROPERTIES

📌 Boiling Point:

- 1° > 2° > 3°

- H-bonding present in 1° and 2° amines

📌 Solubility:

- Lower amines are soluble in water due to H-bonding

- Solubility decreases with increase in alkyl chain

📌 Basic Strength:

Amines are basic due to lone pair on N

- Order (in aqueous): 2° > 1° > 3° > NH₃

────────────────────────

🔸 CHEMICAL REACTIONS

📌 1. **Reaction with HCl (Acid–Base):**

R–NH₂ + HCl → R–NH₃⁺Cl⁻

📌 2. **Acylation (with acid chloride):**

R–NH₂ + R′COCl → R′CONHR + HCl

(Only for 1° and 2° amines)

📌 3. **Alkylation:**

R–NH₂ + R′–X → R–NHR′ → R–NR′₂ (on excess alkyl halide)

📌 4. **Carbylamine Reaction:** (test for 1° amines)

R–NH₂ + CHCl₃ + alc. KOH → R–NC + 3KCl + 3H₂O

→ Foul smell of isocyanide

📌 5. **Reaction with Nitrous Acid:**

- 1° aliphatic amine:

R–NH₂ + HNO₂ → R–OH + N₂ + H₂O

- 1° aromatic amine (Aniline):

C₆H₅NH₂ + HNO₂ → C₆H₅–N₂⁺Cl⁻ + 2H₂O

(Diazonium salt at 273K)

📌 6. **Hinsberg Test (Distinguish 1°, 2°, 3° Amines):**

- Reagent: Benzenesulphonyl chloride (PhSO₂Cl)

| Type | Reaction with PhSO₂Cl | Behavior |

|-----------|----------------------------|---------------------|

| 1° Amine | Forms soluble sulphonamide | Dissolves in base |

| 2° Amine | Forms insoluble sulphonamide | Does not dissolve |

| 3° Amine | No reaction | No change |

────────────────────────

🔸 DIAZONIUM SALTS (Important Part)

📌 Benzene diazonium chloride:

C₆H₅–N₂⁺Cl⁻

Formed by reaction of aniline with HNO₂ at 0–5°C

📌 Sandmeyer Reaction:

C₆H₅–N₂⁺Cl⁻ + CuCl/HCl → C₆H₅Cl

C₆H₅–N₂⁺Cl⁻ + CuBr/HBr → C₆H₅Br

📌 Gattermann Reaction:

C₆H₅–N₂⁺Cl⁻ + Cu/HCl → C₆H₅Cl

📌 Replacement Reactions:

- CN: C₆H₅CN

- OH: C₆H₅OH

- I: C₆H₅I (with KI)

- H: C₆H₆ (with hypophosphorous acid)

📌 Coupling Reaction:

C₆H₅–N₂⁺Cl⁻ + Ar–OH → Azo dye (Ar–N=N–Ph)

────────────────────────

🧠 QUICK RECAP:

✔ Amines: Basic in nature, lone pair on N

✔ Primary amines → carbylamine test + diazonium salt

✔ Diazotisation temp = 273–278K

✔ Hinsberg → distinguish 1°, 2°, 3°

✔ Gabriel synthesis: Only 1° amines

✔ Sandmeyer & Gattermann = substitution via diazonium salt

✔ Aromatic amines less basic due to resonance

🔹 CHAPTER 13: BIOMOLECULES – Structure, Types, and Functions

📘 INTRODUCTION:

Biomolecules are organic molecules found in living organisms that play structural and functional roles in life processes.

🔸 Major Classes:

✔ Carbohydrates

✔ Proteins

✔ Enzymes

✔ Vitamins

✔ Nucleic acids

────────────────────────

🔸 CARBOHYDRATES

📌 General Formula: Cₓ(H₂O)ᵧ

→ Polyhydroxy aldehydes or ketones

📌 Classification:

1. **Monosaccharides** – Single sugar unit

e.g., Glucose (C₆H₁₂O₆), Fructose

2. **Disaccharides** – Two monosaccharides

e.g., Sucrose = Glucose + Fructose

Lactose = Glucose + Galactose

3. **Polysaccharides** – Many sugar units

e.g., Starch, Cellulose, Glycogen

📌 Reducing Sugars:

- Reduce Tollen’s/Fehling’s reagent

- All monosaccharides + lactose, maltose

- Sucrose is **non-reducing**

📌 Glucose Structure:

- Open-chain: Aldehyde group at one end

- Cyclic (Haworth): Pyranose ring (6-membered)

📌 Mutarotation:

- Change in optical rotation due to interconversion of α and β forms

────────────────────────

🔸 PROTEINS

📌 Polymers of α-amino acids

General structure of amino acid:

\text{H}_2\text{N}–CH(R)–COOH

📌 Zwitterion:

At isoelectric point, amino acid exists as dipolar ion:

^+NH₃–CH(R)–COO⁻

📌 Classification:

1. **Fibrous Proteins**: Structural, insoluble (e.g., keratin)

2. **Globular Proteins**: Functional, soluble (e.g., enzymes, hormones)

📌 Structure Levels:

- **Primary**: Sequence of amino acids

- **Secondary**: α-helix or β-sheet (H-bonding)

- **Tertiary**: 3D folding

- **Quaternary**: Multiple polypeptides

📌 Denaturation:

Loss of 3D structure due to heat/pH → protein loses function

────────────────────────

🔸 ENZYMES

📌 Enzymes = Biological catalysts

- Highly specific

- Work at body temperature and pH

📌 Mechanism:

Enzyme + Substrate → Enzyme–Substrate Complex → Product + Enzyme

📌 Examples:

- Amylase (starch digestion)

- Pepsin (protein digestion in stomach)

────────────────────────

🔸 VITAMINS

📌 Organic compounds required in small amounts

📌 Classification:

1. **Water-Soluble**: B-complex, C

– Not stored, need regular intake

2. **Fat-Soluble**: A, D, E, K

– Stored in body fat

📌 Deficiency Diseases:

| Vitamin | Deficiency Disease |

|---------|----------------------------|

| A | Night blindness |

| B₁ | Beriberi |

| C | Scurvy |

| D | Rickets |

| K | Blood clotting disorder |

────────────────────────

🔸 NUCLEIC ACIDS

📌 Genetic material made of nucleotides

→ Nucleotide = Base + Sugar + Phosphate

📌 Types:

1. **DNA** (Deoxyribonucleic acid)

- Sugar: Deoxyribose

- Bases: A, T, G, C

- Double-stranded helix (Watson–Crick model)

2. **RNA** (Ribonucleic acid)

- Sugar: Ribose

- Bases: A, U, G, C

- Single-stranded

📌 Base Pairing in DNA:

A–T (2 H-bonds), G–C (3 H-bonds)

📌 Functions:

- DNA: Genetic code for heredity

- RNA: Protein synthesis (mRNA, tRNA, rRNA)

────────────────────────

🧠 QUICK RECAP:

✔ Carbohydrates = Energy source

✔ Glucose = Aldohexose; Fructose = Ketohexose

✔ Sucrose = Non-reducing sugar

✔ Proteins = Made of amino acids

✔ Enzymes = Biological catalysts

✔ Vitamins = Micronutrients (fat/water soluble)

✔ DNA = Genetic code; RNA = Protein synthesis

✔ Mutarotation & Zwitterion = key concepts

✔ Denaturation = Protein loses function

✔ Tollen’s & Fehling’s test = For reducing sugars

📌 Important Reaction (Glucose with HCN):

\[C₆H₁₂O₆ + HCN → C₆H₁₂O₆CN (cyanohydrin)\]

🔹 CHAPTER 14: POLYMERS – Types, Mechanisms & Examples

📘 INTRODUCTION:

📌 Polymer: High molecular weight macromolecule formed by the repetition of small units (monomers).

📌 Polymerization: Process of forming polymers from monomers.

────────────────────────

🔸 TYPES OF POLYMERS

📌 Based on Source:

1. **Natural Polymers** – Found in nature

e.g., Proteins, Starch, Rubber, Cellulose

2. **Synthetic Polymers** – Man-made

e.g., Nylon-6,6, PVC, Teflon

3. **Semi-synthetic** – Chemically modified natural polymers

e.g., Rayon (from cellulose)

📌 Based on Polymerization:

1. **Addition Polymers**

– Made from unsaturated monomers (double/triple bond)

– No by-product

– e.g., Polyethene, Teflon, PVC

2. **Condensation Polymers**

– Monomers combine with elimination of small molecules (like H₂O, HCl)

– e.g., Nylon, Bakelite, Terylene

📌 Based on Structure:

1. **Linear Polymers** – e.g., High-density polyethene (HDPE)

2. **Branched Chain** – e.g., Low-density polyethene (LDPE)

3. **Cross-linked** – e.g., Bakelite

📌 Based on Molecular Forces:

| Type | Properties | Example |

|-------------------|------------------------------|------------------|

| Elastomers | Elastic, weak bonds | Natural rubber |

| Fibres | High tensile strength | Nylon, Terylene |

| Thermoplastics | Soften on heating | PVC, Polythene |

| Thermosetting | Hard, infusible on heating | Bakelite, Melamine |

────────────────────────

🔸 ADDITION POLYMERS

📌 1. **Polyethene**

- Monomer: Ethene (CH₂=CH₂)

- Types:

– LDPE: Branched, soft

– HDPE: Linear, hard

📌 2. **Polystyrene**

- Monomer: Styrene (C₆H₅–CH=CH₂)

- Uses: Toys, packaging

📌 3. **PVC (Polyvinyl chloride)**

- Monomer: Vinyl chloride (CH₂=CHCl)

- Uses: Pipes, synthetic leather

📌 4. **Teflon (PTFE)**

- Monomer: CF₂=CF₂

- Uses: Non-stick cookware, insulation

📌 5. **Acrylonitrile Polymer (PAN):**

- Monomer: CH₂=CH–CN

- Uses: Synthetic wool

────────────────────────

🔸 CONDENSATION POLYMERS

📌 1. **Nylon-6,6**

- Monomers: Hexamethylenediamine + Adipic acid

- Reaction:

HOOC–(CH₂)₄–COOH + H₂N–(CH₂)₆–NH₂ → Nylon-6,6 + H₂O

- Uses: Fibres, ropes, textiles

📌 2. **Terylene (Dacron)**

- Monomers: Ethylene glycol + Terephthalic acid

- Uses: Fabric, PET bottles

📌 3. **Bakelite**

- Monomers: Phenol + Formaldehyde

- Cross-linked polymer

- Uses: Electrical insulators, handles

📌 4. **Melamine-formaldehyde resin**

- Heat-resistant plastic used in kitchenware

────────────────────────

🔸 NATURAL POLYMERS

| Polymer | Monomer | Use |

|-------------|--------------------|------------------|

| Starch | Glucose | Energy storage |

| Cellulose | Glucose | Plant cell walls |

| Protein | Amino acids | Body structure |

| Natural rubber | Isoprene (2-methyl-1,3-butadiene) | Elastic materials |

────────────────────────

🔸 VULCANISATION OF RUBBER

📌 Natural rubber is soft and sticky.

📌 Vulcanisation: Heating rubber with sulfur

→ Increases strength, elasticity, heat resistance

📌 Monomer of rubber:

CH₂=C(CH₃)–CH=CH₂ \quad \text{(Isoprene)}

────────────────────────

🔸 BIODEGRADABLE & NON-BIODEGRADABLE POLYMERS

📌 Biodegradable Polymers:

- Can be broken down by microbes

- e.g., PHBV (Poly β-hydroxybutyrate-co-β-hydroxyvalerate)

– Monomers: 3-hydroxybutanoic acid + 3-hydroxypentanoic acid

📌 Non-biodegradable: PVC, Polystyrene, Nylon

────────────────────────

🧠 QUICK RECAP:

✔ Addition Polymers = No by-products

✔ Condensation Polymers = Elimination of H₂O/HCl

✔ PVC = CH₂=CHCl → Pipes

✔ Teflon = CF₂=CF₂ → Non-stick

✔ Nylon-6,6 → Condensation of diamine + dicarboxylic acid

✔ Bakelite = Thermosetting

✔ LDPE vs HDPE = branching

✔ Biodegradable = PHBV, polylactic acid

✔ Natural rubber = soft; Vulcanised = strong

📌 Polyblend: Mixture of 2 or more polymers for better quality

📌 Copolymers: Made from 2 different monomers (e.g., Buna-S)

🔹 CHAPTER 15: CHEMISTRY IN EVERYDAY LIFE – Drugs, Detergents & Additives

📘 INTRODUCTION:

Chemistry plays a vital role in our daily life through medicines, food additives, soaps, detergents, and artificial sweeteners.

────────────────────────

🔸 DRUGS & THEIR CLASSIFICATION

📌 **Drug**: A chemical substance used to diagnose, prevent or treat diseases.

📌 Classification Based On:

1. **Pharmacological effect**

→ e.g., Analgesics, Antipyretics

2. **Drug action** (target system)

→ e.g., Inhibits enzyme, receptor blocker

3. **Chemical structure**

→ e.g., Sulpha drugs, Penicillin

4. **Molecular targets**

→ Enzymes or receptors involved in the process

────────────────────────

🔸 TYPES OF DRUGS

📌 **1. Antacids**

→ Neutralize excess acid in the stomach

- e.g., Aluminium hydroxide, Magnesium hydroxide

- Modern antacids: Omeprazole, Ranitidine

📌 **2. Antihistamines**

→ Treat allergy by blocking histamine receptors

- e.g., Diphenhydramine, Cimetidine

📌 **3. Neurologically Active Drugs**

- **Analgesics** (Pain relievers):

- Non-narcotic: Aspirin, Paracetamol

- Narcotic: Morphine, Codeine

- **Tranquilizers** (Mental disorders):

- e.g., Diazepam, Alprazolam, Equanil

📌 **4. Antimicrobials**

→ Kill or inhibit microorganisms

Types:

- Antibiotics: Penicillin, Ampicillin

- Antiseptics: Dettol, Iodine

- Disinfectants: Phenol, Chlorine (used on non-living surfaces)

📌 **5. Antifertility Drugs**

→ Prevent conception

- e.g., Mifepristone, Norethindrone

────────────────────────

🔸 CHEMICALS IN FOOD

📌 **1. Artificial Sweeteners**

- Provide sweetness without calories

- Examples:

- Saccharin

- Aspartame (unstable at high temp)

- Sucralose (stable)

📌 **2. Food Preservatives**

- Prevent spoilage from microbes

- Examples: Sodium benzoate, Salt, Sugar, Vinegar

📌 **3. Antioxidants**

- Prevent oxidation of food

- e.g., BHA (Butylated hydroxyanisole), BHT

────────────────────────

🔸 CLEANSING AGENTS

📌 **1. Soaps**

- Sodium or potassium salts of long-chain fatty acids

- Made by **saponification**:

Fat + NaOH → Glycerol + Soap

- Not effective in hard water (forms scum with Ca²⁺, Mg²⁺)

📌 **2. Synthetic Detergents**

- Made from petrochemicals

- Work in hard and soft water

Types:

- Anionic: Sodium lauryl sulphate (toothpaste, shampoo)

- Cationic: Cetyltrimethylammonium bromide (hair conditioner)

- Non-ionic: No charge; mild, used in liquids

────────────────────────

🔸 ENVIRONMENT & HEALTH

📌 **Antibiotics misuse** → Resistance

📌 **Detergents** → Non-biodegradable → Pollution

📌 **Preservatives and colors** → Toxic in high doses

📌 Safe use of chemicals is essential for health

────────────────────────

🧠 QUICK RECAP:

✔ Antacids = Neutralize HCl in stomach

✔ Antihistamines = Block allergy receptors

✔ Analgesics = Painkillers (narcotic/non-narcotic)

✔ Tranquilizers = Treat anxiety and mental disorders

✔ Antibiotics = Kill/inhibit bacteria

✔ Antiseptics = Used on body

✔ Disinfectants = Used on floors/surfaces

✔ Sweeteners: Saccharin (heat stable), Aspartame (not heat stable)

✔ Soaps = Not for hard water

✔ Detergents = Work in all types of water

✔ Preservatives = Prevent microbial growth in food

📌 Saponification: Fat + Base → Soap + Glycerol

📌 Drug-Target Interaction: Receptor or enzyme inhibition

🔚 **Conclusion: Your Success in Chemistry Starts Here**

With this complete chapter-wise collection of **Class 12 Chemistry formulas**, you now have the most powerful and exam-ready tool at your fingertips. Whether you're preparing for **board exams (CBSE/AHSEC)** or competitive tests like **NEET, JEE, CUET**, mastering formulas is the **foundation to scoring high and solving questions quickly**.

At **Vidya Unnati Academy**, we believe in learning smart, not hard. These formulas are not just for memorization — they’re for application. Use them while practicing questions, solving previous years’ papers, or revising before exams.

🧠 **Our Final Advice:**

1. 📖 **Revise regularly** – even 15 minutes a day can build long-term retention.

2. 🧪 **Apply the formulas in MCQs and numerical questions** — don’t just read them.

3. 📝 **Create your own short notes** alongside this list for maximum clarity.

4. 💬 **Join study groups or coaching discussions** to test your understanding.

5. 🧘 **Take care of your health, sleep, and peace of mind** — they matter as much as formulas.

🎯 Keep visiting **Vidya Unnati Academy** for more such full syllabus content, PDF downloads, practice tests, and exclusive exam strategies designed just for students like you.

📌 **If this post helped you, don’t forget to bookmark, share, and comment your feedback. Your support motivates us to keep creating free resources for students across India.**

✨ **All the best for your Chemistry journey — You’ve got this!**

– Team **Vidya Unnati Academy**

VIDYA UNNATI ACADEMY

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🔥 Complete Class 12 Chemistry Formulas Chapter-wise | All Reactions, Tricks & Notes for Boards & NEET/JEE

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