Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as :
1. Aldol condensation
2. Cannizzaro's reaction
3. Cross Cannizzaro's reaction
4. Cross Aldol condensation
1. Aldol condensation
2. Cannizzaro's reaction
3. Cross Cannizzaro's reaction
4. Cross Aldol condensation
Best answer
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.
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