$C{H_2}CN\xrightarrow{{Na/{C_2}{H_5}OH}}\,A\,\xrightarrow{{HN{O_2}}}\,B\,\xrightarrow{{C{r_2}O_{_7}^{ - 2}}}\,C$
$\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)} $
નીચે આપેલા વિકલ્પોમાંથી સાચો જવાબ પસંદ કરો.
$(a)$ $PhCOOH$
$(B)$ $o-NO_2C_6H_4COOH$
$(C)$ $p-NO_2C_6H_4COOH$
$(D)$ $m-NO_2C_6H_4COOH$


