Chemical Reactions Of Aldehydes Ketones And Carboxylic Acids

The reaction between Benzaldehyde and Ethanal in the presence of dilute sodium hydroxide (NaOH) typically follows the benzoin condensation mechanism, where the aldehydes undergo condensation to form a -hydroxy aldehyde, which, upon heating, undergoes dehydration to form an α,β-unsaturated aldehyde.

1. Reaction Mechanism: - First, benzaldehyde and ethanal undergo condensation in the presence of NaOH to form an intermediate -hydroxy aldehyde. - Upon heating, this intermediate undergoes dehydration to form a conjugated enone, which is a product containing a carbon-carbon double bond (C=C) conjugated with a carbonyl group (C=O).

2. Products: - The product of this reaction will include 3-Phenylprop-2-enal (an aromatic compound with a phenyl group attached to the carbon chain), formed by the condensation of benzaldehyde and ethanal. - The second product, But-2-enal, is formed due to the loss of the water molecule in the final step, and it also contains a conjugated double bond.

Thus, the correct products formed are 3-Phenylprop-2-enal and But-2-enal, which corresponds to option (B).