$C{H_2}CN\xrightarrow{{Na/{C_2}{H_5}OH}}\,A\,\xrightarrow{{HN{O_2}}}\,B\,\xrightarrow{{C{r_2}O_{_7}^{ - 2}}}\,C$
${image}$
${CH}_{3} {COOH}+{SOCl}_{2} \longrightarrow {A} \xrightarrow[AlCl_3]{Benzene} {B} \xrightarrow[-OH]{KCN} {C}$