Identify A and B in each of the following reaction sequence: (a) CH_3 CH_2 Cl → NaCN A → H_2 / Ni B (b) C_6 H_5 NH_2 →[0-5^° C ] NaNO_2 / HCl A →[…

Identify A and B in each of the following reaction sequence :

$\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl} \xrightarrow{\mathrm{NaCN}} \mathrm{A} \xrightarrow{\mathrm{H}_{2} / \mathrm{Ni}} \mathrm{B}$

$\displaystyle \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2} \xrightarrow[0-5^{\circ} \mathrm{C}]{\mathrm{NaNO}_{2} / \mathrm{HCl}} \mathrm{A} \xrightarrow[\mathrm{H}^{+}]{\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}} \mathrm{~B}$