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Question

Which of the following reactions will not give p-amino azobenzene?


  1. 2 only

  2. 1 and 2

  3. 3 only

  4. 1 only

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Solution

The correct option is A

2 only


Explanation for the correct option:

Option (a):

  • The product p-amino azobenzene is formed by the coupling reaction of aniline with the diazonium salt.
  • Benzene diazonium chloride reacts with aniline in which the aniline molecule at its para-position is coupled with the diazonium salt to form p-amino azobenzene. This process is called a coupling reaction.
  • Among the given options, only (2) does not undergo a coupling reaction.
  • Nitrobenzene does not react with any of the given reactants.

Explanation for the incorrect options:

Option (b):

  • (1): Nitro benzene reacts with tin and hydrochloride and gets reduced to aniline. Aniline with nitrous acid forms diazonium salt followed by a coupling reaction to give p-amino azobenzene.
  • (2): It does not undergo a coupling reaction.
  • Since (1) is undergoing the reaction, this is not the correct option.

Option (c):

  • (3): Aniline with nitrous acid forms diazonium salt followed by a coupling reaction to give p-amino azobenzene.
  • Since (3) undergo the reaction, this is not the correct option.

Option (d):

  • (1) undergoes the coupling reaction as already seen. So, this is not the correct option.

Final answer:

Hence, option (a) is the correct answer.


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