${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}+\mathrm{AgOH}\to \mathrm{A}+\mathrm{AgCl}$.

$\mathrm{A}+{\mathrm{CH}}_3\mathrm{COCl}\to \mathrm{C}+\mathrm{HCl}\text{. Here " }\mathrm{C}\text{ " is }$

Given data : It is given to identify C.

Explanation  

 $$\begin{gathered} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}+\mathrm{AgOH}\to \mathrm{A}+\mathrm{AgCl} \\ \mathrm{A}+{\mathrm{CH}}_3\mathrm{COCl}\to \mathrm{C}+\mathrm{HCl} \end{gathered}$$

The chemical is as follows
$$\begin{gathered} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}+\mathrm{AgOH}\underset{-\mathrm{AgCl}}{⟶}{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH} \\ \underset{-\mathrm{HCl}}{\stackrel{{\mathrm{CH}}_3\mathrm{COCl}}{⟶}}{\mathrm{CH}}_3{\mathrm{COOC}}_2{\mathrm{H}}_5 \end{gathered}$$

Hence, the correct option (A). Ethyl acetate.