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Which one of the following can exhibit cis-trans isomerism?

1. CH3—CH=COOH
2. H—C=C—Cl
3. ClCH=CHCl
4. ClCH2—CH2Cl

Correct answer: ClCH=CHCl

Solution

Cis-trans isomerism occurs in compounds with restricted rotation around a double bond and different groups attached to the double-bonded carbons. ClCH=CHCl satisfies these conditions as each carbon in the double bond has two different groups.

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