Hydrocarbons
CBSE · Class 11 · Chemistry
Summary of Hydrocarbons for CBSE Class 11 Chemistry. Key concepts, important points, and chapter overview.
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Overview
Hydrocarbons are compounds of carbon and hydrogen only. They are important sources of energy and also serve as raw materials for fuels, polymers, solvents, dyes, and drugs. Hydrocarbons are classified into saturated, unsaturated, and aromatic types on the basis of carbon-carbon bonds. Alkanes are sa
Key Concepts
Hydrocarbons are divided into saturated
Hydrocarbons are divided into saturated, unsaturated, and aromatic types. Saturated hydrocarbons contain only single bonds, unsaturated hydrocarbons c
Alkanes are saturated open
Alkanes are saturated open-chain hydrocarbons with general formula CnH2n+2. Methane is the first member, and alkanes are also called paraffins because
Methane has a tetrahedral shape
Methane has a tetrahedral shape with H-C-H bond angle 109.5°. Higher alkanes show chain isomerism. For example, butane has two isomers and pentane has
Alkanes are prepared by hydrogenation
Alkanes are prepared by hydrogenation of alkenes and alkynes, reduction of alkyl halides, Wurtz reaction, decarboxylation of carboxylic acids, and Kol
Alkanes react with halogens under light
Alkanes react with halogens under light or heat through initiation, propagation, and termination steps. Chlorination of methane produces chloromethane
Learning Objectives
- Name hydrocarbons according to the IUPAC system.
- Recognise and write structures of isomers of alkanes, alkenes, alkynes, and aromatic hydrocarbons.
- Learn methods of preparation of hydrocarbons.
- Distinguish between alkanes, alkenes, alkynes, and aromatic hydrocarbons on the basis of physical and chemical properties.
- Draw and differentiate between conformations of ethane.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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