A-LevelChemistryHydrocarbons9701/12 · May/June 2023 · Q311 Mark

Bromine reacts with alkenes by an electrophilic addition mechanism in which a cation is formed as an intermediate. Which mixture will produce the most stable intermediate cation?

A3,3-dimethylpent-1-ene + bromine

Bethene + bromine

Cmethylpropene + bromine

Dpropene + bromine

✓ Correct answer

C: methylpropene + bromine

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Topic: Hydrocarbons, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2023 Paper 1 Variant 2, question 31.

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