Which of the following compounds will not give azo coupling reaction with benzene diazonium chloride?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Nitrobenzene
- Azo coupling reaction occurs readily with activated aromatic rings such as phenols and aromatic amines (e.g., aniline, o-toluidine).
- These groups are electron-donating, which activate the ring toward electrophilic substitution by the diazonium ion.
- Nitrobenzene contains a –NO₂ group, which is strongly electron-withdrawing and deactivates the benzene ring. Hence, it does not undergo azo coupling.
Therefore, the compound that will not give an azo coupling reaction is Nitrobenzene.