Hydrocarbons

This document is a comprehensive handwritten study note on Hydrocarbons in Organic Chemistry. It systematically explains the preparation methods, physical and chemical properties, reaction mechanisms, and important industrial and laboratory reactions of alkanes, alkenes, alkynes, and aromatic hydrocarbons. The notes contain detailed reaction equations, mechanisms, catalysts, conditions, stereochemistry, and key concepts frequently asked in competitive and university examinations.

Topics Covered:

• Preparation and reactions of Alkanes

  • Steam reforming

  • Pyrolysis (cracking)

• Preparation of Alkenes

  • Partial reduction of alkynes (Lindlar's catalyst & Birch reduction)

  • Dehydrohalogenation

  • Dehalogenation of vicinal dihalides

  • Dehydration of alcohols

  • Decarboxylation methods

  • Pyrolysis reactions

• Chemical reactions of Alkenes

  • Catalytic hydrogenation

  • Halogenation

  • Hydrohalogenation

  • Markovnikov and Anti-Markovnikov addition

  • Addition of sulphuric acid

  • HOCl addition

  • Hydration

  • Oxidation with KMnO₄

  • Baeyer's test

  • Epoxidation

  • Ozonolysis

  • Polymerization

• Preparation of Alkynes

  • From calcium carbide

  • From vicinal and geminal dihalides

  • Haloform method

  • Dehalogenation of tetrahaloalkanes

• Chemical reactions of Alkynes

  • Acidic nature and salt formation

  • Hydrogenation

  • Halogenation

  • Hydrohalogenation

  • Hydration and keto-enol tautomerism

  • Oxidation

  • Ozonolysis

  • Cyclic polymerization (benzene formation)

  • Preparation of higher alkynes

• Aromatic Hydrocarbons (Benzene)

  • Preparation methods

  • Nitration

  • Halogenation

  • Sulphonation

  • Friedel-Crafts alkylation

  • Friedel-Crafts acylation

  • Hydrogenation

  • Ozonolysis

  • Decarbonylation and related reactions

• Important concepts

  • Electrophilic addition mechanism

  • Electrophilic aromatic substitution

  • Syn and anti addition

  • Saytzeff and Hoffmann products

  • Carbocation rearrangement

  • Free radical mechanism

  • Reaction selectivity and stereochemistry

  • Named catalysts and important reagents used in hydrocarbon chemistry.