The major products A and B for the following reactions are,...

1. In polar aprotic solvent, primary alkyl halides undergo ${S}_{N} {}^{2}$ reaction with $\text{KCN,}$ to give alkyl nitrile.

2. Alkyl nitriles, reduce in presence of ${H}_{2} / \text{Pd,}$ give ${1}^{o} -$ amines.

3. Cyclic ketones, on reduction with ${H}_{2} / \text{Pd,}$ form ${2}^{o} -$ alcohol.



${H}_{2} / Pd$ reduces $- CN$ into $- C{H}_{2} - N{H}_{2}$