CBSE 11 Chemistry · U9
Hydrocarbons
Classification, alkanes, alkenes, alkynes, aromatic hydrocarbons, carcinogenicity and toxicity. Theory weightage: 10 marks.
Test yourself
A focused, distraction-free run through 50 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 9.1
Classification, Formulas and Nomenclature
Alkanes, alkenes, alkynes, aromatic hydrocarbons, homologous series, unsaturation and IUPAC naming.
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Topic 9.2
Alkanes: Preparation, Reactions and Conformations
Preparation by Wurtz reaction and decarboxylation, combustion, free-radical substitution and ethane conformations.
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Topic 9.3
Alkenes: Preparation and Addition Reactions
Preparation by elimination and dehydration, electrophilic addition, Markovnikov rule, peroxide effect, oxidation and ozonolysis.
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Topic 9.4
Alkynes: Acidity, Preparation and Reactions
Preparation of ethyne, terminal alkyne acidity, addition reactions, hydration and tests using ammoniacal silver or cuprous salts.
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Topic 9.5
Aromatic Hydrocarbons and Toxicity
benzene stability, electrophilic substitution, directing effects and hazardous hydrocarbons
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