A-LevelChemistryHalogen derivatives9701/12 · Feb/Mar 2021 · Q251 Mark

Dibromopentanes can undergo 'double elimination' reactions to produce hydrocarbons. 2NaOH + C₅H₁₀Br₂ → C₅H₈ + 2NaBr + 2H₂O Which isomer produces only one hydrocarbon product?

A1,5-dibromopentane

B1,4-dibromopentane

C2,3-dibromopentane

D2,4-dibromopentane

✓ Correct answer

A: 1,5-dibromopentane

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Topic: Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2021 Paper 1 Variant 2, question 25.

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