Explanation:
$\begin{array}{*{20}{c}}
{C{H_2} - CH - C{H_2}} \\
{\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,} \\
{OH\,\,\,\,\,\,\,\,\,OH\,\,\,\,\,\,\,\,\,OH}
\end{array}$ Glycerol is trihydric alcohols.
