A-LevelChemistryHalogen derivatives9701/12 · Feb/Mar 2016 · Q251 Mark

Structural isomerism and stereoisomerism should be considered in answering this question. Compound J is reacted with KOH dissolved in ethanol. Three isomeric alkenes with molecular formula C₄H₈ are formed. What is J?

ACH₃-CH₂-CH₂-CH₂-Br

BCH₃-CH(Br)-CH₂-CH₃

CCH₃-CH(CH₃)-CH₂-Br

DCH₃-C(Br)(CH₃)₂

✓ Correct answer

B: CH₃-CH(Br)-CH₂-CH₃

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Topic: Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2016 Paper 1 Variant 2, question 25.

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