In the presence of a dilute base,C_6H_5CHO an | vedclass

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Question

(D) The reaction between benzaldehyde $(C_6H_5CHO)$ and acetaldehyde $(CH_3CHO)$ in the presence of a dilute base is a cross-aldol condensation reacti

Vedclass · Accepted Answer

$C_6H_5CH=CHCHO$

Vedclass · Answer

(D) The reaction between benzaldehyde $(C_6H_5CHO)$ and acetaldehyde $(CH_3CHO)$ in the presence of a dilute base is a cross-aldol condensation reaction.Acetaldehyde acts as the nucleophile because it has $\alpha$-hydrogens,forming an enolate ion.This enolate attacks the carbonyl carbon of benzaldehyde to form a $\beta$-hydroxy aldehyde $(C_6H_5CH(OH)CH_2CHO)$.Upon heating or dehydration,this intermediate loses a water molecule to form an $\alpha,\beta$-unsaturated aldehyde,which is cinnamaldehyde $(C_6H_5CH=CHCHO)$.

In the presence of a dilute base,$C_6H_5CHO$ and $CH_3CHO$ react together to give a product. The product is

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