Azo Dyes
Easychemistry
Azo dyes are prepared by:
Select the correct option:
Solution
Incorrect! Answer:
Coupling of diazonium salt with phenol/amine
Azo Coupling is an electrophilic aromatic substitution reaction where a diazonium cation acts as an electrophile.
- Reaction: ArN2++Ar′−H→Ar−N=N−Ar′+H+
- The second aromatic ring (Ar′) must be strongly activated by groups like −OH (Phenol) or −NH2 (Aniline).
- Conditions: Phenols couple in weakly basic solution (forming orange dyes), whereas amines couple in weakly acidic solution (forming yellow dyes).
- The resulting Azo compounds have an extended conjugated π system, making them intensely colored dyes.
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
About This Question
- Subject
- chemistry
- Chapter
- organic compounds containing nitrogen
- Topic
- azo dyes
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Coupling of diazonium salt with phenol/amine
Azo Coupling is an electrophilic aromatic substitution reaction where a diazonium cation acts as an electrophile.
- Reaction: ArN2++Ar′−H→Ar−N=N−Ar′+H+
- The second aromatic ring (Ar′) must be strongly activated by groups like −OH (Phenol) or −NH2 (Aniline).
- Conditions: Phenols couple in weakly basic solution (forming orange dyes), whereas amines couple in weakly acidic solution (forming yellow dyes).
- The resulting Azo compounds have an extended conjugated π system, making them intensely colored dyes.
This easy difficulty chemistry question is from the chapter organic compounds containing nitrogen, covering the topic of azo dyes. It appeared in the 2025 exam.
Looking for more practice? Explore all chemistry questions or browse organic compounds containing nitrogen questions on RankGuru.