Which of the following reaction/s will not gi | vedclass

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(B) In basic or neutral medium,$N-N$ coupling is favourable,while in slightly acidic medium,$C-N$ coupling is favourable to form $p-$aminoazobenzene.R

Vedclass · Accepted Answer

Only $B$

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(B) In basic or neutral medium,$N-N$ coupling is favourable,while in slightly acidic medium,$C-N$ coupling is favourable to form $p-$aminoazobenzene.Reaction $A$: Nitrobenzene is reduced to aniline by $Sn/HCl$,then diazotized by $HNO_2$ to form benzene diazonium chloride,which couples with aniline in acidic medium to give $p-$aminoazobenzene.Reaction $B$: $NaBH_4$ is a selective reducing agent and does not reduce nitrobenzene to aniline. Therefore,no diazonium salt is formed,and $p-$aminoazobenzene is not produced.Reaction $C$: Aniline is directly diazotized by $HNO_2$ to form benzene diazonium chloride,which then couples with aniline in acidic medium to give $p-$aminoazobenzene.Thus,only reaction $B$ will not give $p-$aminoazobenzene.

Which of the following reaction/s will not give $p-$aminoazobenzene?

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