Assertion A : Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of the hydrolysis increases.
Reason R : I is a good nucleophile as well as a good leaving group.In the light of the above statements, choose the correct answer from the options given below

Options

A. A is false but R is true
B. A is true but R is false
C. Both A and R are true but R is NOT the correct explanation of A
D. Both A and R are true and R is the correct explanation of A

Answer

To solve the question, we need to analyze the Assertion (A) and Reason (R) provided in the statement.

### Step 1: Analyze the Assertion
**Assertion A:** Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of the hydrolysis increases.

- Hydrolysis of alkyl chlorides (R-Cl) is generally a slow reaction due to the stability of the carbon-chlorine bond. Chlorine is a relatively poor leaving group compared to other halides.
- When NaI is added, the iodide ion (I⁻) acts as a nucleophile, which can attack the carbon atom of the alkyl chloride more effectively.

### Step 2: Analyze the Reason
**Reason R:** I⁻ is a good nucleophile as well as a good leaving group.

- Iodide (I⁻) is indeed a good nucleophile due to its larger size and lower electronegativity compared to other halides, which allows it to donate its electron pair more readily.
- Additionally, I⁻ is also a good leaving group because it is stable in solution after leaving, thus facilitating the reaction.

### Step 3: Establish the Relationship
- The assertion states that the rate of hydrolysis increases in the presence of NaI, and the reason provided explains why this happens: I⁻ is both a good nucleophile and a good leaving group.
- Since both the assertion and reason are true, and the reason explains the assertion, we can conclude that the two statements are logically connected.

### Conclusion
Both the assertion and the reason are true, and the reason explains the assertion. Therefore, the correct answer is option 3.

---