Which of the following reaction/s will not give \(p-\) aminoazobenzene?

Question

Which of the following compound will not undergo Azo coupling reaction?

Answer 1

To determine which reaction does not give \(p-\)aminoazobenzene, let's analyze each option:

Option A:
- (i) Sn/HCl is used to reduce the nitro group to an amino group.
- (ii) HNO₂ converts the amine to a diazonium salt.
- (iii) Reaction with aniline leads to the formation of \(p-\)aminoazobenzene.
Therefore, Reaction A will give \(p-\)aminoazobenzene.
Option B:
- (i) NaBH₄ generally reduces the nitro group to an amino group.
- (ii) NaOH is unlikely to change the primary nature of the intermediate amine in the context of azobenzene formation.
- (iii) Despite the interaction with aniline, this method is not typically useful for creating diazonium salts or azo compounds.
Therefore, Reaction B will not lead to the formation of \(p-\)aminoazobenzene.
Option C:
- (i) HNO₂ in acidic conditions forms a diazonium salt from an amine group.
- (ii) Reaction with aniline through diazonium salt coupling leads to \(p-\)aminoazobenzene.
Hence, Reaction C will produce \(p-\)aminoazobenzene.

Conclusion: Based on the above analysis, Reaction B is the only one that does not produce \(p-\)aminoazobenzene.

Answer 2

To determine which reaction does not give \(p-\)aminoazobenzene, let's analyze each option:

Option A:
- (i) Sn/HCl is used to reduce the nitro group to an amino group.
- (ii) HNO₂ converts the amine to a diazonium salt.
- (iii) Reaction with aniline leads to the formation of \(p-\)aminoazobenzene.
Therefore, Reaction A will give \(p-\)aminoazobenzene.
Option B:
- (i) NaBH₄ generally reduces the nitro group to an amino group.
- (ii) NaOH is unlikely to change the primary nature of the intermediate amine in the context of azobenzene formation.
- (iii) Despite the interaction with aniline, this method is not typically useful for creating diazonium salts or azo compounds.
Therefore, Reaction B will not lead to the formation of \(p-\)aminoazobenzene.
Option C:
- (i) HNO₂ in acidic conditions forms a diazonium salt from an amine group.
- (ii) Reaction with aniline through diazonium salt coupling leads to \(p-\)aminoazobenzene.
Hence, Reaction C will produce \(p-\)aminoazobenzene.

Conclusion: Based on the above analysis, Reaction B is the only one that does not produce \(p-\)aminoazobenzene.

The Correct Option is B