9701 MCQ Solution 37

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Question 37: [Organic > Introductory Organic]:
Which compounds show cis-trans isomerism?
1 but-2-ene
2 but-1-ene
3 2-methylpropene
Reference: Past Exam Paper – November 2002 Paper 1 Q37



Solution 37:
Answer: D.

In but-2-ene the unsaturated carbons have 2 pairs of the same group thus can exhibit cis-trans isomerism. 
In but-1-ene one of the unsaturated carbons have a repeated group thus it cannot exhibit cis-trans isomerism. 
Since 2 is incorrect 3 must also be incorrect and the only valid option is D.

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