13. HYDROCARBONS (HM)
Explanation:
(b)
$\xrightarrow{{{O_3}}}\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{OHC - {{(C{H_2})}_3}CH - CHO}
\end{array}$ $\xrightarrow{{[O]}}\mathop {\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{HOOC - {{(C{H_2})}_3} - CH - COOH}
\end{array}}\limits_{Substituted\,adipic\,acid} $