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Answer: 4. Cross Aldol condensation

Benzaldehyde has no \(\alpha\)-hydrogen, while acetophenone has \(\alpha\)-hydrogens. In dilute NaOH, acetophenone forms an enolate which attacks benzaldehyde, then loses water to give an \(\alpha,\beta\)-unsaturated ketone (chalcone).

Two different carbonyl compounds are involved, so this is a crossed (cross) aldol condensation (Claisen-Schmidt), option (4). Cannizzaro reactions need strong base and no \(\alpha\)-hydrogen on either partner.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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