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For π-overlap, the lobes of the atomic orbitals are perpendicular to the line joining the nuclei. Which statement is correct?

1. π-overlap occurs in sp hybridisation.
2. π-overlap occurs in sp² hybridisation.
3. π-overlap occurs in sp³ hybridisation.
4. π-overlap occurs in dsp³ hybridisation.

Correct answer: π-overlap occurs in sp² hybridisation.

Solution

π-overlap occurs when unhybridized p orbitals on adjacent atoms overlap sideways. This is possible in sp² hybridization, where one p orbital remains unhybridized for π-bond formation.

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