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Hydrocarbons

Karnataka Board · Class 11 · Chemistry

Quick revision notes for Hydrocarbons — Karnataka Board Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Classification and General Introduction

  • Hydrocarbons contain only carbon and hydrogen atoms
  • Three main categories: Saturated (alkanes), Unsaturated (alkenes, alkynes), and Aromatic
  • Saturated hydrocarbons have only single bonds (C-C and C-H)
2

Alkanes - Structure, Nomenclature, and Isomerism

  • Saturated hydrocarbons with sp³ hybridized carbon atoms
  • Tetrahedral geometry with bond angles of 109.5°
  • C-C bond length: 154 pm, C-H bond length: 112 pm
3

Alkanes - Preparation and Reactions

  • Preparation methods: Hydrogenation of alkenes/alkynes, Reduction of alkyl halides, Wurtz reaction, Decarboxylation
  • Chemical properties: Generally unreactive (called paraffins)
  • Substitution reactions: Halogenation by free radical mechanism
4

Alkenes - Structure, Nomenclature, and Isomerism

  • Contain C=C double bond with sp² hybridized carbons
  • Double bond consists of one σ bond (397 kJ/mol) and one π bond (284 kJ/mol)
  • C=C bond length: 134 pm (shorter than C-C single bond)

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Full Notes

Key Concepts

Hydrocarbons are classified into three mainAlkanes have sp3 hybridized carbon atomsAlkenes contain C=C double bonds consistingAlkynes contain C≡C triple bondsBenzene (C6H6) exhibits aromaticity characterized by

Frequently Asked Questions

What are the important topics in Hydrocarbons for Karnataka Board Class 11 Chemistry?
Hydrocarbons covers several key topics that are frequently asked in Karnataka Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Hydrocarbons — Karnataka Board Class 11 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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