How is phenol obtained from aniline ?

Explanation

To obtain phenol from aniline, follow these steps:

### Step 1: Diazotization of Aniline
1. **React Aniline with Nitrous Acid**: Aniline (C6H5NH2) is treated with nitrous acid (HNO2).
- **Preparation of Nitrous Acid**: Nitrous acid can be prepared by mixing sodium nitrite (NaNO2) with hydrochloric acid (HCl) at a temperature of 0 to 5 degrees Celsius (273 to 278 K).
- **Reaction**:
\[
\text{C}_6\text{H}_5\text{NH}_2 + \text{HNO}_2 \rightarrow \text{C}_6\text{H}_5\text{N}_2^+\text{Cl}^-
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