Assertion `(A)`: `SN^(2)` reaction is carried out in the presence of polar aprotic solvent.
Reason `(R): Polar aprotic solvents do not contain acidic hydrogen.

Options

A. Both `(A)` and `(R)` are true and `(R0` is the correct explanation of `(A)`.
B. Both `(A)` and `(R)` are true but `(R)` is not the correct explanation of `(A)`.
C. `(A) is true but `(R)` is false.
D. `(A) is false but `(R)` is true.

Explanation

**Step-by-Step Solution:**

1. **Understanding SN2 Reactions:**
- The SN2 (Substitution Nucleophilic Bimolecular) reaction is a type of nucleophilic substitution where the rate of reaction depends on the concentration of both the substrate (alkyl halide) and the nucleophile.
- It is characterized as a single-step mechanism where the nucleophile attacks the carbon atom from the opposite side of the leaving group, leading to a transition state where both the nucleophile and leaving group are partially bonded to the carbon.

2. **Role of Polar Aprotic Solvents:**
- Polar aprotic solvents are solvents that have a significant dipole moment but do not have acidic hydrogen atoms. Examples include dimethylformamide (DMF), acetone, and dimethyl sulfoxide (DMSO).
- These solvents do not donate protons (H+) and therefore do not stabilize carbocations, making them suitable for SN2 reactions.

3. **Assertion Analysis:**
- The assertion states that "SN2 reactions are carried out in the presence of polar aprotic solvents." This statement is true because polar aprotic solvents enhance the nucleophilicity of the nucleophile without stabilizing the leaving group.

4. **Reason Analysis:**
- The reason states that "polar aprotic solvents do not contain acidic hydrogen." This statement is also true, as polar aprotic solvents lack hydrogen atoms that can be easily donated to form H+ ions.

5. **Linking Assertion and Reason:**
- While both the assertion and reason are true, the reason does not adequately explain why SN2 reactions are favored in polar aprotic solvents. The key factor is that polar aprotic solvents enhance nucleophilicity, not just the absence of acidic hydrogen.

6. **Conclusion:**
- Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion. Therefore, the answer is that both A and R are correct, but R is not the correct explanation of A.

**Final Answer:**
Option B: Both A and R are correct, but R is not the correct explanation of A.

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