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Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

1. Butanol
2. 2-Butyne
3. 2-Butenol
4. 2-Butene

Correct answer: 2-Butene

Solution

Cis-trans isomerism occurs in compounds with restricted rotation, such as alkenes with different groups attached to the double-bonded carbons. Among the options, only 2-Butene satisfies this condition.

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