$\begin{matrix} CH-C{{O}_{2}}H \\ \,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\ CH-C{{O}_{2}}H \\ \end{matrix}\xrightarrow[(two\,mole)]{NaOH}(A)\xrightarrow{electrolysis}(B);$