Phenol is obtained by heating aqueous solution of :

Options

A. Aniline
B. Benzene diazonium chloride
C. Benzoic acid
D. None of these

Answer

To solve the question of how phenol is obtained by heating an aqueous solution, we need to analyze the options provided.

### Step-by-Step Solution:

1. **Identify the Options**: We need to consider the compounds given in the options. The question asks which compound, when heated in an aqueous solution, will yield phenol.

2. **Analyze Aniline**:
- Aniline (C6H5NH2) contains an amino group (-NH2) attached to a benzene ring.
- When heated in an aqueous solution, there is no significant reaction that would lead to the formation of phenol. The lone pair on the nitrogen does not facilitate a reaction with water to form phenol.

3. **Analyze Benzene Diazonium Chloride**:
- Benzene Diazonium Chloride (C6H5N2Cl) can be formed from aniline through diazotization.
- When benzene diazonium chloride is heated in an aqueous solution, it undergoes hydrolysis. The nitrogen gas (N2) is released, and a hydroxyl group (-OH) replaces the diazonium group, resulting in the formation of phenol (C6H5OH).
- Therefore, this option is likely to yield phenol upon heating.

4. **Analyze Benzoic Acid**:
- Benzoic Acid (C6H5COOH) consists of a carboxylic acid group attached to a benzene ring.
- When benzoic acid is heated, it undergoes decarboxylation, which results in the loss of carbon dioxide (CO2) and leaves behind benzene (C6H6). This does not lead to the formation of phenol.

5. **Conclusion**:
- The only compound that, when heated in an aqueous solution, produces phenol is Benzene Diazonium Chloride. Therefore, the correct answer is option 2: Benzene Diazonium Chloride.

### Final Answer:
Phenol is obtained by heating an aqueous solution of **Benzene Diazonium Chloride**.

---