c
\(\begin{array}{*{20}{c}}
{\,\,C{H_2}OH\,} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{CHOH\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,\,C{H_2}OH\,\,}
\end{array}\xrightarrow{{3HI}}\begin{array}{*{20}{c}}
{\,\,C{H_2}I} \\
{||\,\,\,\,\,} \\
{CHI} \\
{|\,\,\,\,\,\,} \\
{\,\,C{H_2}I}
\end{array}\xrightarrow{{ - {I_2}}}\begin{array}{*{20}{c}}
{\,\,C{H_2}\,\,\,} \\
{||\,\,\,\,\,\,\,\,\,} \\
{CH\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,} \\
{C{H_2}I\,}
\end{array}\)
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