$C{H_2}CN\xrightarrow{{Na/{C_2}{H_5}OH}}\,A\,\xrightarrow{{HN{O_2}}}\,B\,\xrightarrow{{C{r_2}O_{_7}^{ - 2}}}\,C$
\(\mathop {C{H_3}C{H_2}OH}\limits_{(B)} \,\xrightarrow{{C{r_2}O_{_7}^{ - 2}/{H^ + }}}\,\mathop {C{H_3}COOH}\limits_{(C)} \)
$[ C ]$ શોધો.