CAIE A-Level Chemistry AS 14 Hydrocarbons Questions

Practise alkane and alkene reactions, from cracking and combustion to radical substitution, addition and oxidative cleavage.

Covered syllabus points

14.1 Alkanes 14.2 Alkenes

[Maximum number: 1]

Different hydrocarbon mixtures produced from fractional distillation of crude oil have different uses.

State the compound that is heated with long-chain hydrocarbons to produce more useful smaller alkanes and alkenes.

$\mathrm{Al}_{2} \mathrm{O}_{3}$ / aluminium oxide

[Maximum number: 1]

When heated with KOH dissolved in ethanol, halogenoalkanes can undergo an elimination reaction to form alkenes.

What are the possible elimination products when 2-bromobutane is heated with KOH dissolved in ethanol?

$\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}$ only

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}$ only

$\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}$

$\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}$ and $\mathrm{CH}_{2}=\mathrm{CHCH}=\mathrm{CH}_{2}$

[Maximum number: 1]

Which reaction occurs when ethane and chlorine are mixed in diffused sunlight?

a free-radical substitution with hydrogen given off

a free-radical substitution with hydrogen chloride given off

a free-radical substitution with no gas given off

a nucleophilic substitution with hydrogen chloride given off

[Maximum number: 1]

A molecule of geraniol is shown.

geraniol

What is formed when geraniol is reacted with an excess of cold dilute acidified $\mathrm{MnO}_{4}^{-}$ ?

Figure for Question 4 — CAIE A-Level Chemistry AS — Option A

Figure for Question 4 — CAIE A-Level Chemistry AS — Option B

Figure for Question 4 — CAIE A-Level Chemistry AS — Option C

Figure for Question 4 — CAIE A-Level Chemistry AS — Option D

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Covered syllabus points

Question 1

Question 2

Question 3

Question 4