Sodium benzene sulphonate reacts with NaOH and then on acidic hydrolysis, it gives:

Options

A. Phenol
B. Benzoic acid
C. Benzene
D. Disodium benzaldehyde

Answer

To solve the question regarding the reaction of sodium benzene sulphonate with NaOH followed by acidic hydrolysis, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- Sodium benzene sulphonate (C6H5SO3Na) is the starting compound. It consists of a benzene ring (C6H5) attached to a sulfonate group (SO3^−) and sodium ion (Na^+).

2. **Reaction with Sodium Hydroxide (NaOH)**:
- When sodium benzene sulphonate reacts with sodium hydroxide, the sulfonate group (SO3^−) can be replaced by a hydroxyl group (OH^−). This is a nucleophilic substitution reaction.
- The reaction can be represented as:
\[ C6H5SO3Na + NaOH \rightarrow C6H5O^-Na^+ + Na^+SO3^- \]
- The product of this reaction is sodium phenoxide (C6H5O^−Na^+) and sodium sulfonate (Na^+SO3^−).

3. **Acidic Hydrolysis**:
- The next step involves acidic hydrolysis. When sodium phenoxide is treated with an acid (e.g., HCl or H2SO4), the sodium ion is replaced by a hydrogen ion (H^+).
- The reaction can be represented as:
\[ C6H5O^-Na^+ + H^+ \rightarrow C6H5OH + Na^+ \]
- The final product of this reaction is phenol (C6H5OH).

4. **Final Product**:
- Therefore, the final product obtained after the reaction of sodium benzene sulphonate with NaOH followed by acidic hydrolysis is phenol.

### Conclusion:
The overall reaction can be summarized as:
\[ \text{Sodium benzene sulphonate} \xrightarrow{\text{NaOH}} \text{sodium phenoxide} \xrightarrow{\text{Acidic Hydrolysis}} \text{Phenol} \]

### Final Answer:
The product is **Phenol (C6H5OH)**.