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Question

The restricted rotation about carbon double bond in 2-butene is due to

A
overlap of one s and one sp2 hybridized orbitals
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B
overlap of two sp2 hybridized orbitals
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C
overlap of one p and one sp2 hybridized orbitals
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D
sideways overlap of two p orbitals
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Solution

The correct option is D sideways overlap of two p orbitals
Restricted rotation about C=C bond in 2-butene is not possible due to sideways overlap of 2p orbitals. π-bond gives rigidity to molecule, the rotation around the double bond is prevented. The restriction in free rotation makes the position of groups attached to sp2 hybrid C fixed into space. Hence, the correct answer is option (d).

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