b
\(\begin{matrix}
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\, \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|| \\
Br-C{{H}_{2}}-C-Cl \\
\end{matrix}\xrightarrow{C{{H}_{3}}OH}\) \(\begin{matrix}
\,\,\,O \\
\,\,\,|| \\
Br-C{{H}_{2}}-C-O-C{{H}_{3}} \\
\end{matrix}\)