An organic compound (A) of molecular formula C_(7)H_(6)O is called as oil of bitter almonds. (A) on oxidation gives (B) of molecular formula C_(7)H_(6)O_(2) which gives brisk effervescence with aqueous alcoholic KCN, compound ( C) is formed. Identify A, B and C and write the equations.

An organic compound (A) of molecular formula C_(7)H_(6)O is called as

1.	An organic compound (A) of molecular formula C_(7)H_(6)O is called as oil of bitter almonds. (A) on oxidation gives (B) of molecular formula C_(7)H_(6)O_(2) which gives brisk effervescence with aqueous alcoholic KCN, compound ( C) is formed. Identify A, B and C and write the equations.
Answer» Solution :(i) From the molecular formula, (A) is identified as benzaldehyde and it is called as oil of BITTER almonds. (ii) Benzaldehyde is oxidised to benzoic acid by alkaline permanganate which gives brisk effervescence with `NaHCO_(3)`. `underset((A))(C_(6)H_(5)CHO)overset((O))tounderset((B))(C_(6)H_(5))-COOH` (iii) When benzaldehyde is refluxed with AQUEOUS alcoholic KCN, BENZOIN ( C) is formed. `underset((A))(C_(6)H_(5)CH=O+H-overset(O)overset(\|\|)(C)-C_(6)H_(5))underset(KCN)overset("alc")tounderset((C))(C_(6)H_(5)-underset(OH)underset(\|)(CH)-overset(O)overset(\|\|)(C)-C_(6)H_(5))`