Diazotization
Easychemistry
Diazotization of aniline performed at low temperature (~0–5°C) because:
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Solution
Incorrect! Answer:
Diazonium salt unstable and decomposes at higher temperature
- The Reaction: C6H5NH2+NaNO2+2HCl→C6H5N2+Cl− (Benzene diazonium chloride).
- Intermediate Nature: Diazonium salts are relatively unstable, especially those of aliphatic amines. Aromatic diazonium salts are stabilized by resonance but only at low temperatures.
- Decomposition: If the temperature rises above 5∘C or 10∘C, the salt undergoes hydrolysis.
- Reaction Products: It reacts with the water in the medium to form phenol and releases Nitrogen gas (N2).
- Conclusion: Maintaining ice-cold conditions is critical to keep the diazonium salt intact for further synthetic steps like the Sandmeyer reaction.
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About This Question
- Subject
- chemistry
- Chapter
- nitrogen organics
- Topic
- diazotization
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Diazonium salt unstable and decomposes at higher temperature
- The Reaction: C6H5NH2+NaNO2+2HCl→C6H5N2+Cl− (Benzene diazonium chloride).
- Intermediate Nature: Diazonium salts are relatively unstable, especially those of aliphatic amines. Aromatic diazonium salts are stabilized by resonance but only at low temperatures.
- Decomposition: If the temperature rises above 5∘C or 10∘C, the salt undergoes hydrolysis.
- Reaction Products: It reacts with the water in the medium to form phenol and releases Nitrogen gas (N2).
- Conclusion: Maintaining ice-cold conditions is critical to keep the diazonium salt intact for further synthetic steps like the Sandmeyer reaction.
This easy difficulty chemistry question is from the chapter nitrogen organics, covering the topic of diazotization. It appeared in the 2025 exam.
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