Diazo Coupling
Easychemistry
Diazonium salts couple with phenols in alkaline solution to form:
Select the correct option:
Solution
Incorrect! Answer:
Azobenzene dyes
- Coupling Reaction: Diazonium salts act as weak electrophiles. They can react with highly activated aromatic rings like phenols or anilines.
- Environment: For Phenol, a weakly alkaline medium (pH≈92˘01310) is used to convert phenol to the more reactive phenoxide ion.
- Product Structure: The two aromatic rings are linked by an azo group (−N=N−), creating an extended conjugated system.
- Appearance: Due to the conjugation, these azo-compounds are intensely colored and are used as dyes (e.g., p-hydroxyazobenzene is orange).
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About This Question
- Subject
- chemistry
- Chapter
- nitrogen organics
- Topic
- diazo coupling
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Azobenzene dyes
- Coupling Reaction: Diazonium salts act as weak electrophiles. They can react with highly activated aromatic rings like phenols or anilines.
- Environment: For Phenol, a weakly alkaline medium (pH≈92˘01310) is used to convert phenol to the more reactive phenoxide ion.
- Product Structure: The two aromatic rings are linked by an azo group (−N=N−), creating an extended conjugated system.
- Appearance: Due to the conjugation, these azo-compounds are intensely colored and are used as dyes (e.g., p-hydroxyazobenzene is orange).
This easy difficulty chemistry question is from the chapter nitrogen organics, covering the topic of diazo coupling. It appeared in the 2025 exam.
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