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, "Phenol is obtained by heating aqueous solution of:", we need to analyze the options provided and determine which one leads to the formation of phenol when heated.

### Step-by-Step Solution:

1. **Identify the Compounds**: We have four options to consider:
- Option 1: Aniline
- Option 2: Benzene diazonium chloride
- Option 3: Benzoic acid
- Option 4: None of these

2. **Recall the Reaction for Phenol Formation**: Phenol can be synthesized from benzene diazonium chloride through a specific reaction when heated in an aqueous solution.

3. **Analyze Each Option**:
- **Option 1: Aniline**: Aniline does not directly yield phenol upon heating. It is an amine and would require different conditions to produce phenol.
- **Option 2: Benzene diazonium chloride**: This compound, when heated in an aqueous solution, undergoes a reaction to produce phenol, nitrogen gas, and hydrochloric acid. The reaction is as follows:
\[ \text{C}_6\text{H}_5\text{N}_2\text{Cl} + \text{H}_2\text{O} \rightarrow \text{C}_6\text{H}_5\text{OH} + \text{N}_2 + \text{HCl} \]
- **Option 3: Benzoic acid**: Heating benzoic acid does not yield phenol directly; it typically requires decarboxylation or other reactions.
- **Option 4: None of these**: This option can be ruled out since we have identified a valid compound that yields phenol.

4. **Conclusion**: The only compound that leads to the formation of phenol when heated in an aqueous solution is benzene diazonium chloride.

5. **Final Answer**: Therefore, the correct answer is **Option 2: Benzene diazonium chloride**.