\(\underset{Dipot.\,\,succinate}{\mathop{\begin{matrix}
   C{{H}_{2}}COOK  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   C{{H}_{2}}COOK  \\
\end{matrix}}}\,\) \(\xrightarrow{ionization}\) \(\begin{matrix}
   C{{H}_{2}}CO{{O}^{-}}  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   C{{H}_{2}}CO{{O}^{-}}  \\
\end{matrix}\) \(+2K^+\)

\(2{{H}_{2}}O\,\overset{ionization}{\longleftrightarrow}2O{{H}^{-\,}}+\,2{{H}^{+}}\)

At anode :

\(\begin{matrix}
   C{{H}_{2}}CO{{O}^{-}}  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   C{{H}_{2}}CO{{O}^{-}}  \\
\end{matrix}\) \(\xrightarrow{2{{e}^{-}}}\)  \(\underset{Unstable}{\mathop{\left[ \begin{matrix}
   C{{H}_{2}}COO  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   C{{H}_{2}}COO  \\
\end{matrix} \right]}}\,\) \(\to \) \(\begin{matrix}
   C{{H}_{2}}  \\
   ||\,\,\,\,\,\,  \\
   C{{H}_{2}}  \\
\end{matrix}\) \(+\,2CO_2\)

At cathode :

\(2H^+ + 2e^-\to [2H]\to H_2\)