A-LevelChemistryHalogen derivatives9701/12 · May/June 2014 · Q291 Mark

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?

ACH3CH=CHCH3 only

BCH3CH2CH=CH2 only

CCH3CH=CHCH3 and CH3CH2CH=CH2

DCH3CH=CHCH3 and CH2=CHCH=CH2

✓ Correct answer

C: CH3CH=CHCH3 and CH3CH2CH=CH2

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Topic: Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2014 Paper 1 Variant 2, question 29.

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