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

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

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




${\mathrm{H}}_2/\mathrm{P}\mathrm{d}$ reduces $-\mathrm{C}\mathrm{N}$ into $-\mathrm{C}{\mathrm{H}}_2-\mathrm{N}{\mathrm{H}}_2$