Assertion: Benzyl bromide when kept in acetone water produces benzyl alcohol.
Reason: The reaction follows `S_(N)2` mechanism.

Options

A. If the both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true and the reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false statements.

Explanation

To solve the given question, we need to analyze the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that benzyl bromide, when kept in acetone-water, produces benzyl alcohol.
- Benzyl bromide (C6H5CH2Br) is a primary alkyl halide.

2. **Reaction Conditions**:
- The solvent used is a mixture of acetone and water. Acetone is a polar aprotic solvent, while water is a polar protic solvent. This combination can facilitate nucleophilic substitution reactions.

3. **Mechanism of Reaction**:
- The reaction proceeds via an `S_N2` mechanism. In this mechanism, a nucleophile attacks the electrophilic carbon atom bonded to the bromine atom, leading to the displacement of the bromine atom.
- In this case, water (H2O) acts as the nucleophile. The oxygen atom in water has lone pairs of electrons that can attack the carbon atom.

4. **Reaction Process**:
- The nucleophilic attack occurs as follows:
- The oxygen atom of water attacks the carbon atom of benzyl bromide.
- The C-Br bond breaks, and bromide ion (Br-) is released.
- This results in the formation of benzyl alcohol (C6H5CH2OH).

5. **Final Product**:
- The final product of the reaction is indeed benzyl alcohol, confirming the assertion.

6. **Understanding the Reason**:
- The reason states that the reaction follows the `S_N2` mechanism.
- Since benzyl bromide is a primary alkyl halide, it is more likely to undergo `S_N2` reactions rather than `S_N1` reactions, which are more common for tertiary alkyl halides.

7. **Conclusion**:
- Both the assertion and the reason are true, and the reason correctly explains the assertion.

### Final Answer:
Both assertion and reason are true. The reason is the correct explanation of the assertion.