For the preparation of $p-$nitroiodobenzene from $p-$nitroaniline, the best method is
A$NaN{O_2}/HCl$ followed by $KI$
B$NaN{O_2}/HCl$ followed by $CuCN$
C$LiAl{H_4}$ followed by ${I_2}$
D$NaB{H_4}$ followed by ${I_2}$
Medium
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A$NaN{O_2}/HCl$ followed by $KI$
a (a) $p-$nitrobenzene from $p-$nitroaniline.
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$(X){{C}_{4}}{{H}_{7}}OCl\xrightarrow{N{{H}_{3}}}{{C}_{4}}{{H}_{9}}ON\xrightarrow[KOH]{B{{r}_{2}}}C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}N{{H}_{2}};$ Compound $(X)$ is