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