b
\((b)\) \(\begin{matrix}
CHO\,\,\,\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
CH-OH\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,\,\,C{{H}_{2}}-OH\, \\
\end{matrix}\,\xrightarrow{2HI{{O}_{4}}}2HC{{O}_{2}}H+HCHO\)