$\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{CH = O\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}} \\
{{{(CH - OH)}_4}} \\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_2} - OH}
\end{array}$ $\xrightarrow{{B{r_2}/{H_2}O}}P$ ; $P$ is
A $\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{COOH\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}} \\
{{{(CH - OH)}_4}} \\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_2} - OH}
\end{array}$ B $\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{CH = O\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}} \\
{{{(CH - OH)}_4}} \\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,\,COOH\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ C $\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{CH = O\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}} \\
{{{(CH - OH)}_4}} \\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,\,CH = O\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ D $\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{COOH\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}} \\
{{{(CH - OH)}_4}} \\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,\,COOH\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ Solution
A $\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{COOH\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}} \\
{{{(CH - OH)}_4}} \\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_2} - OH}
\end{array}$