Question

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

• A. overlap of one s and one $s{p}^2$ hybridized orbitals
• B. overlap of two $s{p}^2$ hybridized orbitals
• C. overlap of one p and one $s{p}^2$ hybridized orbitals
• D. sideways overlap of two p orbitals

Answer 1

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 $s{p}^2$ hybrid C fixed into space. Hence, the correct answer is option (d).