1️⃣ #ISOMERISM
✔️ Compounds having same molecular formula
✔️ But different arrangement of atoms
✔️ Hence different properties
📌 Types:
✔️ Structural isomerism
✔️ Stereoisomerism


2️⃣ #STRUCTURALISOMERISM
✔️ Difference in connectivity of atoms
📌 Types:
✔️ Chain isomerism
✔️ Position isomerism
✔️ Functional isomerism
✔️ Metamerism
✔️ Tautomerism


3️⃣ #CHAINISOMERISM
✔️ Different carbon chain arrangement
📌 Example:
✔️ n-Butane & isobutane (C₄H₁₀)
✔️ Seen in alkanes


4️⃣ #POSITIONISOMERISM
✔️ Same functional group
✔️ Different position on carbon chain
📌 Example:
✔️ 1-butanol & 2-butanol


5️⃣ #FUNCTIONALISOMERISM ⭐
✔️ Different functional groups
📌 Example:
✔️ Alcohol (C₂H₆O) ↔ Ether (C₂H₆O)
✔️ Aldehyde ↔ Ketone
✔️ Very common NEET MCQ


6️⃣ #METAMERISM
✔️ Different alkyl groups around polyvalent atom
📌 Example:
✔️ Ethers, amines


7️⃣ #TAUTOMERISM ⭐⭐
✔️ Dynamic equilibrium between two structures
✔️ Differs in position of H and double bond
📌 Example:
✔️ Keto ⇌ Enol
✔️ Acid/base catalysed
✔️ Keto form usually more stable


8️⃣ #STEREOISOMERISM
✔️ Same structural formula
✔️ Different spatial arrangement
📌 Types:
✔️ Geometrical isomerism
✔️ Optical isomerism


9️⃣ #GEOMETRICALISOMERISM
✔️ Due to restricted rotation (C=C)
📌 Conditions:
✔️ Each C of double bond attached to two different groups
📌 Types:
✔️ cis
✔️ trans
📌 Example:
✔️ cis-2-butene & trans-2-butene


🔟 #OPTICALISOMERISM
✔️ Due to chiral carbon (asymmetric C)
📌 Chiral carbon:
✔️ Carbon attached to 4 different groups
📌 Property:
✔️ Rotates plane polarized light
✔️ d- & l- forms
PART–B : REACTION MECHANISM


1️⃣1️⃣ #REACTIONMECHANISM
✔️ Step-by-step description of how reaction occurs
✔️ Shows movement of electrons


1️⃣2️⃣ #BOND_FISSION
✔️ Breaking of covalent bond
📌 Types:
✔️ Homolytic
✔️ Heterolytic


1️⃣3️⃣ #HOMOLYTICFISSION
✔️ Equal bond breaking
✔️ Each atom gets one electron
📌 Forms:
✔️ Free radicals
📌 Example:
✔️ Cl₂ → 2Cl•
✔️ Occurs in UV / heat


1️⃣4️⃣ #HETEROLYTICFISSION
✔️ Unequal bond breaking
✔️ One atom gets both electrons
📌 Forms:
✔️ Carbocation
✔️ Carbanion
📌 Example:
✔️ CH₃–Cl → CH₃⁺ + Cl⁻


1️⃣5️⃣ #REACTIONINTERMEDIATES ⭐
✔️ Short-lived species
📌 Types:
✔️ Free radicals
✔️ Carbocation
✔️ Carbanion


1️⃣6️⃣ #CARBOCATION
✔️ Positively charged carbon
✔️ sp² hybridised
📌 Stability order:
✔️ 3° > 2° > 1° > CH₃⁺
✔️ Shows rearrangement


1️⃣7️⃣ #CARBANION
✔️ Negatively charged carbon
✔️ sp³ hybridised
📌 Stability order:
✔️ CH₃⁻ > 1° > 2° > 3°


1️⃣8️⃣ #FREERADICAL
✔️ Neutral species with unpaired electron
📌 Stability order:
✔️ 3° > 2° > 1° > CH₃

1️⃣9️⃣ #NUCLEOPHILE
✔️ Electron-rich species
✔️ Donates electron pair
📌 Examples:
✔️ OH⁻, CN⁻, NH₃


2️⃣0️⃣ #ELECTROPHILE
✔️ Electron-deficient species
✔️ Accepts electron pair
📌 Examples:
✔️ H⁺, NO₂⁺, BF₃


2️⃣1️⃣ #NEET⚠️IMPORTANTPOINTS
✔️ Functional isomerism very common
✔️ Tautomerism = dynamic equilibrium
✔️ Stability of carbocation frequently asked
✔️ Identify nucleophile/electrophile carefully


2️⃣2️⃣ #ONELINEREVISION
✔️ Same formula, different structure → isomerism
✔️ Keto–enol = tautomerism
✔️ Chiral carbon → optical activity
✔️ Carbocation most stable = 3°
✔️ Nucleophile = electron donor

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#ALKANES
✔️ Saturated hydrocarbons
✔️ Only C–C & C–H single bonds
✔️ Least reactive hydrocarbons
📌 General formula:
✔️ CₙH₂ₙ₊₂
📌 Hybridisation:
✔️ Carbon → sp³
📌 Geometry:
✔️ Tetrahedral (109.5°)


2️⃣ #NOMENCLATURE
✔️ Longest carbon chain = parent
✔️ Lowest locant rule
✔️ Alkyl groups as substituents
📌 Example:
✔️ (CH₃)₃CH → 2-methylpropane


3️⃣ #ISOMERISM ⭐
✔️ Chain isomerism only
📌 First alkane showing isomerism:
✔️ Butane (C₄H₁₀) ⭐⭐
📌 Note:
✔️ More branching → more stable


4️⃣ #PHYSICALPROPERTIES
✔️ Colourless, odourless
✔️ Insoluble in water
✔️ Soluble in organic solvents
📌 Boiling point:
✔️ ↑ with molar mass
✔️ Straight chain > branched ⭐


5️⃣ #PREPARATIONOFALKANES
(a) #WURTZREACTION ⭐
✔️ Alkyl halide + Na (dry ether)
📌 Reaction:
2R–X + 2Na → R–R + 2NaX
📌 Limitation:
✔️ Unsymmetrical alkanes not formed
(b) #DECARBOXYLATION
✔️ Sodium salt + soda lime
📌 Reaction:
R–COONa → R–H + Na₂CO₃
✔️ Carbon number decreases by 1
(c) #KOLBEELECTROLYSIS ⭐
✔️ Electrolysis of sodium salt of acid
📌 Product:
✔️ Alkane with even number of carbons


6️⃣ #CHEMICALPROPERTIES ⭐⭐


7️⃣ #COMBUSTION
✔️ Burns in excess O₂
✔️ Highly exothermic
📌 Example:
CH₄ + 2O₂ → CO₂ + 2H₂O


8️⃣ #SUBSTITUTIONREACTION ⭐⭐⭐
✔️ Characteristic reaction of alkanes
📌 Halogenation:
✔️ UV light / heat
📌 Example:
CH₄ + Cl₂ → CH₃Cl + HCl
✔️ Free-radical mechanism


9️⃣ #FREERADICALMECHANISM ⭐⭐
📌 Steps:
✔️ Initiation
✔️ Propagation
✔️ Termination
📌 Radical stability:
✔️ 3° > 2° > 1° > CH₃•


🔟 #SELECTIVITYOFHALOGENS
✔️ Chlorination → fast, less selective
✔️ Bromination → slow, more selective
📌 Reactivity:
F₂ > Cl₂ > Br₂ > I₂


1️⃣1️⃣ #CONTROLLEDOXIDATION ⭐
✔️ Oxidising agents: KMnO₄ / K₂Cr₂O₇
📌 NCERT sequence:
CH₄ → HCHO → HCOOH → CO₂


1️⃣2️⃣ #NITRATIONOFALKANES
✔️ With conc. HNO₃
📌 Condition:
✔️ 400–500 K
📌 Example:
CH₄ → CH₃NO₂


1️⃣3️⃣ #ISOMERISATION ⭐
✔️ Straight chain → branched
📌 Catalyst:
✔️ Anhydrous AlCl₃ / HCl
📌 Example:
n-Butane → Isobutane


1️⃣4️⃣ #PYROLYSIS / CRACKING ⭐⭐⭐
✔️ Thermal decomposition
✔️ Absence of air
📌 Products:
✔️ Lower alkane + alkene
📌 Example:
C₁₀H₂₂ → C₅H₁₂ + C₅H₁₀


1️⃣5️⃣ #AROMATISATION (REFORMING)
✔️ Higher alkanes → aromatic
📌 Example:
n-Hexane → Benzene + H₂
📌 Conditions:
✔️ 773 K
✔️ Pt / Cr₂O₃ / Al₂O₃


1️⃣6️⃣ #CONFORMATIONSOFETHANE ⭐
✔️ Due to C–C rotation
📌 Types:
✔️ Staggered (most stable)
✔️ Eclipsed (least stable)
📌 Reason:
✔️ Torsional strain


1️⃣7️⃣ #NEETIMPORTANTPOINTS
✔️ Alkanes → substitution only
✔️ First isomerism → butane
✔️ Branched alkane → lower BP
✔️ Cracking = alkene + alkane
✔️ Free radical mechanism


1️⃣8️⃣ #ONELINEREVISION
✔️ Alkanes = saturated
✔️ Formula = CₙH₂ₙ₊₂
✔️ sp³ hybridisation
✔️ Halogenation = substitution
✔️ Combustion highly exothermic

1️⃣ #ALKENES
✔️ Unsaturated hydrocarbons
✔️ Contain one or more C=C double bond
📌 General formula:
✔️ CₙH₂ₙ (one double bond)
📌 Hybridisation:
✔️ Carbon of C=C → sp²
📌 Geometry:
✔️ Trigonal planar (120°)


2️⃣ #NOMENCLATURE
✔️ Longest chain containing C=C
✔️ Lowest number to double bond
✔️ Suffix → –ene
📌 Example:
✔️ CH₂=CH₂ → Ethene


3️⃣ #ISOMERISM ⭐
✔️ Chain isomerism
✔️ Position isomerism
✔️ Geometrical isomerism (cis–trans) ⭐⭐
📌 Condition for geometrical isomerism:
✔️ Each C of C=C attached to two different groups


4️⃣ #PHYSICALPROPERTIES
✔️ Colourless
✔️ Insoluble in water
✔️ Slightly soluble in organic solvents
📌 Boiling point:
✔️ Increases with molar mass
✔️ cis > trans (due to polarity) ⭐


5️⃣ #PREPARATIONOFALKENES
(a) #DEHYDRATIONOFALCOHOL ⭐
✔️ Alcohol → Alkene + H₂O
📌 Reagent:
✔️ Conc. H₂SO₄ (443 K)
✔️ Al₂O₃ (623 K)
📌 Example:
CH₃CH₂OH → CH₂=CH₂
(b) #DEHYDROHALOGENATION ⭐
✔️ Alkyl halide + alcoholic KOH
📌 Example:
CH₃CH₂Cl → CH₂=CH₂
(c) #DEHALOGENATION
✔️ Vicinal dihalide + Zn
📌 Example:
BrCH₂–CH₂Br → CH₂=CH₂


6️⃣ #CHEMICALPROPERTIES ⭐⭐


7️⃣ #ADDITIONREACTIONS ⭐⭐⭐
✔️ Characteristic reaction of alkenes
(a) #HYDROGENATION
✔️ Alkene + H₂ → Alkane
📌 Catalyst:
✔️ Ni / Pt / Pd
📌 Example:
CH₂=CH₂ → CH₃–CH₃
(b) #HALOGENATION ⭐
✔️ Alkene + X₂
📌 Observation:
✔️ Decolourisation of bromine water ⭐
📌 Example:
CH₂=CH₂ + Br₂ → BrCH₂–CH₂Br
(c) #HYDROHALOGENATION ⭐⭐
✔️ Alkene + HX
📌 Follows Markovnikov’s rule
📌 Example:
CH₃–CH=CH₂ + HBr → CH₃–CHBr–CH₃


8️⃣ #MARKOVNIKOVSRULE ⭐⭐⭐
✔️ H adds to C with more H atoms
✔️ X adds to C with less H atoms


9️⃣ #ANTIMARKOVNIKOVRULE (PEROXIDEEFFECT) ⭐⭐
✔️ In presence of peroxide
✔️ Only with HBr
📌 Example:
CH₃–CH=CH₂ + HBr → CH₃–CH₂–CH₂Br


🔟 #HYDRATIONOFALKENES
✔️ Alkene + H₂O → Alcohol
📌 Catalyst:
✔️ Dil. H₂SO₄
📌 Follows Markovnikov rule


1️⃣1️⃣ #OXIDATIONOFALKENES ⭐⭐
(a) Mild oxidation
✔️ Cold alkaline KMnO₄
✔️ Gives vicinal diol (glycol)
📌 Test:
✔️ Baeyer’s test ⭐
(b) Ozonolysis ⭐⭐⭐
✔️ Alkene + O₃
📌 Product:
✔️ Aldehydes / ketones
📌 Used to locate double bond


1️⃣2️⃣ #POLYMERISATION ⭐
✔️ Many alkene molecules → polymer
📌 Example:
✔️ Ethene → Polyethene


1️⃣3️⃣ #STABILITYOFALKENES ⭐
✔️ More substituted alkene → more stable
📌 Order:
✔️ Tetra > Tri > Di > Mono


1️⃣4️⃣ #NEETIMPORTANTPOINTS
✔️ Alkenes show addition reactions
✔️ Markovnikov rule frequently asked
✔️ Peroxide effect only with HBr
✔️ Baeyer test detects C=C
✔️ Ozonolysis → double bond position


1️⃣5️⃣ #ONELINEREVISION
✔️ Alkenes = unsaturated
✔️ Formula = CₙH₂ₙ
✔️ sp² hybridisation
✔️ Addition reactions dominate
✔️ Ozonolysis identifies structure

1️⃣ #SOLUTION
✔️ Homogeneous mixture
✔️ Consists of solute + solvent
📌 Example:
✔️ Sugar in water


2️⃣ #TYPESOFSOLUTIONS
✔️ Solid in liquid → sugar + water
✔️ Liquid in liquid → alcohol + water
✔️ Gas in liquid → CO₂ in water
✔️ Gas in gas → air


3️⃣ #SOLUBILITY ⭐
✔️ Maximum amount of solute that dissolves in a given amount of solvent
✔️ At given temperature & pressure
📌 Units:
✔️ g / 100 g solvent
✔️ mol L⁻¹


4️⃣ #FACTORAFFECTINGSOLUBILITY ⭐⭐
(a) Nature of solute & solvent
✔️ Like dissolves like
✔️ Polar in polar, non-polar in non-polar
(b) Temperature
✔️ Solid in liquid → solubility ↑ with temp
✔️ Gas in liquid → solubility ↓ with temp ⭐
(c) Pressure
✔️ Significant only for gases
✔️ Solubility ↑ with pressure


5️⃣ #HENRYSLAW ⭐⭐⭐
✔️ Solubility of gas ∝ pressure of gas
📌 Statement:
✔️ At constant temperature, amount of gas dissolved is directly proportional to its partial pressure
📌 Formula:
✔️ p = kₕ x
Where:
✔️ p = partial pressure
✔️ x = mole fraction
✔️ kₕ = Henry’s constant
📌 Applications (PYQ):
✔️ Soft drinks
✔️ Scuba diving
✔️ High altitude sickness


6️⃣ #SOLUBILITYOFGASES ⭐⭐
✔️ Increases with pressure
✔️ Decreases with temperature
📌 Example:
✔️ Cold water holds more oxygen


7️⃣ #RAOULTSLAW ⭐⭐⭐
✔️ For ideal solutions
📌 Statement:
✔️ Partial vapour pressure of each component ∝ its mole fraction
📌 Formula:
✔️ pₐ = xₐ pₐ⁰
✔️ Total pressure = pₐ + pᵦ


8️⃣ #IDEALSOLUTION
✔️ Obeys Raoult’s law at all concentrations
✔️ ΔHmix = 0
✔️ ΔVmix = 0
📌 Example:
✔️ Benzene + toluene


9️⃣ #NON-IDEALSOLUTION
✔️ Deviates from Raoult’s law
📌 Types:
✔️ Positive deviation
✔️ Negative deviation


🔟 #POSITIVEDDEVIATION ⭐
✔️ A–B attraction < A–A or B–B
✔️ Vapour pressure ↑
📌 Example:
✔️ Ethanol + acetone


1️⃣1️⃣ #NEGATIVEDEVIATION ⭐
✔️ A–B attraction > A–A or B–B
✔️ Vapour pressure ↓
📌 Example:
✔️ Chloroform + acetone


1️⃣2️⃣ #COLLIGATIVEPROPERTIES ⭐⭐
✔️ Depend only on number of solute particles
📌 Types:
✔️ Relative lowering of vapour pressure
✔️ Elevation of boiling point
✔️ Depression of freezing point
✔️ Osmotic pressure


1️⃣3️⃣ #OSMOTICPRESSURE ⭐⭐
✔️ Pressure required to stop osmosis
📌 Formula:
✔️ π = CRT
✔️ Used to determine molar mass


1️⃣4️⃣ #NEETIMPORTANTPOINTS
✔️ Henry’s law → gases
✔️ Raoult’s law → ideal solutions
✔️ Gas solubility ↓ with temp
✔️ Colligative properties depend on particles
✔️ Osmotic pressure works at room temp


1️⃣5️⃣ #ONELINEREVISION
✔️ Solution = homogeneous mixture
✔️ Solubility depends on T, P, nature
✔️ Henry’s law → p ∝ x
✔️ Raoult’s law → vapour pressure
✔️ Colligative → number of particles