
when $\underset{(i)}{\mathop{\gamma =C{{H}_{3}}CO_{2}^{-},}}\,\,\,\,\,\,\underset{(ii)}{\mathop{Cl-C{{H}_{2}}-CO_{2}^{-},}}\,\,\,\,\,\,\,\underset{(iii)}{\mathop{Ph-SO_{3}^{-}}}\,$


$C_2H_5-Br\overset{AgCN}{\rightarrow}A\overset{H_2/Ni}{\rightarrow}B$
Product $B$ is