An organic compound (A) of molecular formula C_7H_6Oreacts with acedaldehyde in the presence of sodium ethoxide gives (B) of formula C_9H_8Oan unsaturated aldehyde. Compound (A) reacts with acetic anhydride in the presence of sodium acetate gives (C) and (D) of formula C_9H_8O_2 & C_2H_4O_2 respectively. Identify A,B,C,D and explain the reaction involved.

An organic compound (A) of molecular formula C_7H_6Oreacts with acedal

1.	An organic compound (A) of molecular formula C_7H_6Oreacts with acedaldehyde in the presence of sodium ethoxide gives (B) of formula C_9H_8Oan unsaturated aldehyde. Compound (A) reacts with acetic anhydride in the presence of sodium acetate gives (C) and (D) of formula C_9H_8O_2 & C_2H_4O_2 respectively. Identify A,B,C,D and explain the reaction involved.
Answer» Solution : (i) From the molecular formula (A) is identified as BENZALDEHYDE `C_6H_5CHO` .Benzaldehyde reacts with acetaldehyde to give cinnamaldehyde as B in Claisen condensation reaction. `underset("benzaldehyde (A)")(C_6H_5CHO) + underset("acetaldehyde")(CH_3CHO) underset(DELTA H^(+) )overset(C_2H_5ONa)(to) underset("cinnmaldehyde (B)")(C_6H_5CH = CH - CHO + H_2O)` (ii) Benzaldehyde reacts with acetic ANHYDRIDE (perkin.s reaction) to give cinnamic acid (C ) as product ` C_6H_5 + CH_3CO - O-COCH_3 overset(CH_3COONa)(to) underset("cinnamic acid (C )")(C_6H_5CH = CH - COOH) + underset("acetic acid (D)")(CH_3COOH)`