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Question

But-2-ene exhibits cis-trans isomerism due to:

A
rotation around C3C4 sigma bond
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B
restricted rotation around C=C bond
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C
rotation around C1C2 bond
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D
rotation around C2C3 double bond
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Solution

The correct option is D restricted rotation around C=C bond
Geometrical isomerism in alkenes is possible due to the restricted rotation around the double bond. Hence, But-2-ene exhibts cis-trans isomerism due to restricted rotation aroun C=C bond.

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