\(\begin{array}{*{20}{c}}
{\,\,\,\,\,\begin{array}{*{20}{c}}
{\,\,\,\,C{H_3}\,\,} \\
{|\,\,\,\,}
\end{array}} \\
{C{H_3} - C - X + } \\
{\,\,\,\,\,|\,\,\,\,} \\
{\,\,\,\,\,\,\,\,\,C{H_3}\,\,\,}
\end{array}\) \(NaOC_2H_5\,\to \) \(\mathop {\begin{array}{*{20}{c}}
{\,\,\,\,\,C{H_3}} \\
{|\,} \\
{C{H_3} - C = C{H_2}}
\end{array}}\limits_{2\, - \,methyl\,propane} \)
$(1)$ $\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\, \\
{{H}_{3}}C-C-C{{H}_{2}}-Cl \\
\end{matrix}$
$(2)$ ${{H}_{2}}C-C{{H}_{2}}-C{{H}_{2}}-Cl$
$(3)$ ${{({{H}_{3}}C)}_{3}}C-Cl$
નીપજ $"P"$ શોધો.