Explanation:
$\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,\,\,\,} \\
{C{H_3}C - OC{H_3}}
\end{array}$ $\xrightarrow{{PhMgBr}}$ $\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,OMgBr} \\
{|\,\,\,\,\,}
\end{array}} \\
{C{H_3} - C - OC{H_3}} \\
{|\,\,\,\,\,} \\
{Ph\,\,}
\end{array}\,$
\(\xrightarrow{{ - MgBr(OC{H_3})}}\) $\begin{array}{*{20}{c}}
{\,\,\,\,\,O} \\
{\,\,\,\,\,\,||\,\,} \\
{C{H_3} - C - Ph}
\end{array}$ $\xrightarrow{{PhMgBr}}$ $\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,OMgBr} \\
{\,\,|}
\end{array}} \\
{C{H_3} - C - Ph} \\
{\,\,|} \\
{\,\,\,\,Ph}
\end{array}$
\(\xrightarrow{{{H^ + }}}\) $\mathop {\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{\,\,\,\,\,OH} \\
|
\end{array}\,\,} \\
{C{H_3}C - Ph} \\
{|\,\,\,} \\
{Ph}
\end{array}}\limits_{{\text{1,1 - diphenyl}}\,\,{\text{ethanol}}} $
