Azo Dyes
Azo dyes are prepared by:
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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.
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