Question:
Identify A in the following reaction.
Identify A in the following reaction.
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Aniline with NaNO2 and HCl at 273 K gives benzene diazonium chloride, which on warming with water gives phenol.
Updated On: Nov 12, 2026
- Cumene hydroperoxide
- Sodium benzene sulfonate
- Sodium phenoxide
- Benzene diazonium chloride
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Primary aromatic amines react with nitrous acid (\(\text{NaNO}_{2}\) + \(\text{HCl}\)) at \(273\)-\(278\) K to form diazonium salts.
Step 2: Follow the scheme
Aniline \(\xrightarrow{\text{NaNO}_{2}/\text{HCl},\ 273\,\text{K}}\) \(\text{C}_{6}\text{H}_{5}\text{N}_{2}^{+}\text{Cl}^{-}\) (A)
Warming A with water gives phenol and \(\text{N}_{2}\).
Step 3: Identify A
Compound A is benzene diazonium chloride.
Final Answer:
Compound A is benzene diazonium chloride. \[ \boxed{\text{(D) }\text{Benzene diazonium chloride}} \]
Primary aromatic amines react with nitrous acid (\(\text{NaNO}_{2}\) + \(\text{HCl}\)) at \(273\)-\(278\) K to form diazonium salts.
Step 2: Follow the scheme
Aniline \(\xrightarrow{\text{NaNO}_{2}/\text{HCl},\ 273\,\text{K}}\) \(\text{C}_{6}\text{H}_{5}\text{N}_{2}^{+}\text{Cl}^{-}\) (A)
Warming A with water gives phenol and \(\text{N}_{2}\).
Step 3: Identify A
Compound A is benzene diazonium chloride.
Final Answer:
Compound A is benzene diazonium chloride. \[ \boxed{\text{(D) }\text{Benzene diazonium chloride}} \]
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