The question asks: which reaction(s) will not give $p$-aminoazobenzene.

However, the actual reaction schemes labeled A, B, C are not present in the prompt. Only the answer choices are given:

• A: C only
• B: A only
• C: A and B
• D: B only

So the problem is missing essential information needed to derive the answer independently.

1. What is required to solve this?

To decide whether a reaction gives $p$-aminoazobenzene, we must know the specific transformations in reactions A, B, and C. Typically, such questions involve:

1. Diazotization of aniline or substituted aniline
2. Coupling with aniline/acetanilide
3. Possible protection/deprotection steps

Without the actual reaction sequences, it is impossible to verify which one fails.

2. Can we infer anything from the stored answer?

The stored correct answer is D, which corresponds to:

$\text{B only}$

That means, according to the stored key, reaction B does not give $p$-aminoazobenzene, while the others do.

3. Comparison with stored answer

Because the reaction schemes are missing, I cannot independently check whether B only is correct.

So I cannot honestly derive the result from chemistry principles using the information provided.

4. Final conclusion

• The question is incomplete as stated.
• If we must report the answer strictly from the stored key, then the answer is D (B only).
• But this cannot be independently validated without seeing reactions A, B, and C.