Chemistry - AMINES Question with Solution | TestHub

In (A), nitrobenzene is reduced to aniline by Sn/HCl, then diazotized with HNO₂, and finally coupled with aniline to give p-aminoazobenzene.

In (C), aniline is directly diazotized and then undergoes azo coupling with aniline, again forming p-aminoazobenzene.

In (B), NaBH₄/NaOH does not reduce nitrobenzene to aniline under normal conditions.

Therefore, the diazonium salt required for azo coupling is not formed.

Hence, p-aminoazobenzene cannot be obtained through reaction (B).

Therefore, the reaction that will not give p-aminoazobenzene is (B) only.