$(1)$ $\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\, \\
{{H}_{3}}C-C-C{{H}_{2}}-Cl \\
\end{matrix}$
$(2)$ ${{H}_{2}}C-C{{H}_{2}}-C{{H}_{2}}-Cl$
$(3)$ ${{({{H}_{3}}C)}_{3}}C-Cl$
$C{H_3}Cl\,\,\xrightarrow{{KCN}}\,\,(A)\,\,\xrightarrow{{{H_2}{O^ + }}}\,\,(B)\,\,\xrightarrow{{N{H_3}}}\,\,(C)\,\,\xrightarrow{\Delta }\,\,(D)$