$\underset{(X)}{\mathop{\begin{matrix}
C{{H}_{3}}-CH-C{{O}_{2}}H \\
|\,\,\,\,\,\,\,\,\, \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{2}}-OH \\
\end{matrix}}}\,$ $\xrightarrow{NaHC{{O}_{3}}}$ $\begin{matrix}
C{{H}_{3}}-CH-CO_{2}^{\Theta }+C{{O}_{2}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,C{{H}_{2}}-OH \\
\end{matrix}$