$\begin{matrix}
CH-C{{O}_{2}}H \\
\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
CH-C{{O}_{2}}H \\
\end{matrix}\xrightarrow[(two\,mole)]{NaOH}(A)\xrightarrow{electrolysis}(B);$
$C{H_2} = C{H_2}\xrightarrow{{HBr}}X\xrightarrow{{{\text{Hydrolysis}}}}Y\mathop {\xrightarrow{{N{a_2}C{O_3}}}}\limits_{{I_2}{\text{ excess}}} Z$