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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: Overlap of two sp2-hybridized orbitals

Solution

The restricted rotation is due to the overlap of two sp2-hybridized orbitals.

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