$C{H_2}CN\xrightarrow{{Na/{C_2}{H_5}OH}}\,A\,\xrightarrow{{HN{O_2}}}\,B\,\xrightarrow{{C{r_2}O_{_7}^{ - 2}}}\,C$
$\mathop {C{H_3}C{H_2}OH}\limits_{(B)} \,\xrightarrow{{C{r_2}O_{_7}^{ - 2}/{H^ + }}}\,\mathop {C{H_3}COOH}\limits_{(C)} $
$\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{F}_{3}}\,C\,OH+C{{H}_{3}}\,CH\,C{{H}_{3}} \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,| \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OH \\
\end{matrix}\xrightarrow{{{H}_{2}}S{{O}_{4}}}\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{F}_{3}}\,C\,OCH\,C{{H}_{3}}+{{H}_{2}}O \\
|\,\,\,\,\,\,\,\,\,\,\,\, \,\,\,\, \\
C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}$
એસીટોએસીટીક એસ્ટર $\xrightarrow{NaOEt}$ $\xrightarrow{C{{H}_{3}}I}$ $\xrightarrow{NaOEt}$ $\xrightarrow{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br}$
$(A)\, CH_3CO_2H$ $(B)\, MeOCH_2CO_2H$
$(C)\,CF_2CO_2H$ $(D)\,$