$CH_3CH_2Cl \xrightarrow{NaCN}(i)\xrightarrow{Ni/{{H}_{2}}}(ii)\xrightarrow{acetic\,anhydride}(iii)$ , Product $(iii)$ is
$Z$ is identified as :
$'C'$ is water soluble
Correct structure of $A$ and $D$ are