a
\(\underset{\begin{smallmatrix}
2\,,\,2\,~dichloropropane \\
(isomer\text{ }of\,{{C}_{3}}{{H}_{6}}C{{l}_{2}})
\end{smallmatrix}}{\mathop{\begin{matrix}
\begin{matrix}
Cl \\
| \\
\end{matrix} \\
C{{H}_{3}}-C-C{{H}_{3}} \\
| \\
\,\,Cl \\
\end{matrix}}}\,+\underset{aqueous}{\mathop{2KOH}}\,\) \(\xrightarrow[-\,2KCl]{boil}\) \(\underset{Unstable}{\mathop{\begin{matrix}
\begin{matrix}
\,\,\,\,OH \\
| \\
\end{matrix} \\
C{{H}_{3}}-C-C{{H}_{3}} \\
| \\
\,\,\,\,\,OH \\
\end{matrix}}}\,\xrightarrow[\Delta ]{-\,{{H}_{2}}O}\) \(\underset{(Acetone)}{\mathop{\begin{matrix}
O \\
|| \\
C{{H}_{3}}-C-C{{H}_{3}} \\
\end{matrix}}}\,\)