c
$\underset{Ethylene\,\,glycol}{\mathop{\begin{matrix}
C{{H}_{2}}OH \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{2}}OH \\
\end{matrix}}}\,$ $+\,\underset{Periodic\,\,acid}{\mathop{\,HI{{O}_{4}}\,\,}}\,\to $ $\underset{(oxidising\,agent)}{\mathop{2\begin{matrix}
{{}^{H}} \\
_{H} \\
\end{matrix}\begin{matrix}
\backslash \\
/ \\
\end{matrix}C=O+HI{{O}_{3}}}}\,$