
$A\xrightarrow{{{\text{Reduction}}}}B\xrightarrow{{HN{O_2}}}{C_2}{H_5}OH$
$3,4,5-$Tribromoaniline $\underset{\text{(ii) }{{H}_{3}}P{{O}_{2}}}{\mathop{\xrightarrow{\text{(i) diazotization}}}}\,\,?$

The structure of $D$ is
$I.\,\,CH_2=CHCH_2NH_2$
$II.\,\, CH_3CH_2CH_2NH_2$
$III. CH \equiv CC{H_2}N{H_2}$
Statement $II :$ The lone pair of electrons on nitrogen in pyridine makes it basic.
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