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Which of the following will not show cis-trans isomerism?

1. CH3—CH=CH—CH3
2. CH3—CH2—CH=CH—CH2—CH3
3. CH3—CH=CH—CH2—CH3
4. CH3—CH=CH—CH=CH—CH3

Correct answer: CH3—CH2—CH=CH—CH2—CH3

Solution

Cis-trans isomerism arises due to restricted rotation around a double bond and requires different groups attached to the doubly bonded carbons. In option B, the double bond is flanked by identical groups (CH2—CH3 on both sides), so it cannot exhibit cis-trans isomerism.

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