A Dibromo derivative (A) on treatment with KCN followed by acid hydrolysis and heating gives a monobasic acid (B) along with liberation of `CO_2`. (B) on heating with liquid ammonia followed by treating with `Br_2"/"KOH` gives (C ) which on treating with `NaNO_3` and HCl at low temprerature followed by oxidation gives a monobasic acid (D) having molecular mass 74. Identify A to D.

Explanation

A dibromo derivative (A) on treatment with KCN followed by acid hydrolysis and heating gives a monobaisic acid (B) having molecular mass 74. (B) on heating with liquid ammonia followed by treating with `Br_2"/"KOH` gives (C ) along with liberation of `C_2`. (C ) which on teating with `NaNO_2` and HCl at low temperature followed by oxidation gives (D). Identify (A) to (D).
(A) Propyl Bromide (B) Butanoic acid
(C ) Propulamine (D) Propionic acid.