$PhCHO + Ph \cdot CHO \xrightarrow[in\,\,{{D}_{2}}O]{NaOD} A + \begin{matrix} O \\ || \\ Ph-C-{{O}^{-}} \\ \end{matrix}$$\left( Ph\right.$ is $\left.- C _{6} H _{5}\right)$
$\begin{matrix}
O\,\,\,\, \\
\,||\,\,\,\, \\
C{{H}_{3}}-C-Cl\xrightarrow{{{H}_{2}}S} \\
\end{matrix}$ નીપજ
$C{H_3}COOH\xrightarrow{{LiAl{H_4}}}A\xrightarrow{{PC{l_5}}} $ $B\xrightarrow{{Alc.\,KOH}}C,$
નિપજ $C$ શું હશે ?
ઉપરની પ્રક્રિયામાં '$A$' શોધો