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

1. Overlap of one s- and sp2-hybridized orbitals
2. Overlap of one p- and one sp2-hybridized orbitals
3. Sideways overlap of two p-orbitals
4. Overlap of two sp2-hybridized orbitals

Correct answer: Sideways overlap of two p-orbitals

Solution

The restricted rotation in 2-butene arises due to the sideways overlap of two p-orbitals forming a π-bond, which prevents free rotation around the double bond.

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