Assertion: Methoxy ethane reacts with HI to give ethanol and iodomethane
Reason: Reaction of ether with HI follows `S_(N)^(2)` mechanism

Options

A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C. Assertion is correct statement but reason is wrong statement.
D. Assertion is wrong statement but reason is correct statement.

Answer

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

**Assertion:** Methoxy ethane reacts with HI to give ethanol and iodomethane.
**Reason:** Reaction of ether with HI follows an \( S_N2 \) mechanism.

### Step-by-Step Solution:

1. **Identify the Reactants and Products:**
- Methoxy ethane (also known as ethyl methyl ether) has the structure \( CH_3OCH_2CH_3 \).
- When it reacts with hydroiodic acid (HI), it produces ethanol (\( CH_3CH_2OH \)) and iodomethane (\( CH_3I \)).

2. **Mechanism of Reaction:**
- The ether (methoxy ethane) reacts with HI. The iodine (I) in HI is a good nucleophile and will attack the ether.
- The oxygen in the ether has lone pairs and can act as a nucleophile, leading to the cleavage of the C-O bond.

3. **Formation of Products:**
- The reaction can be visualized as:
\[ CH_3OCH_2CH_3 + HI \rightarrow CH_3I + CH_3CH_2OH \]
- Here, one methyl group (from methoxy ethane) is converted into iodomethane, and the other part becomes ethanol.

4. **Mechanism Type:**
- The reaction follows an \( S_N2 \) mechanism because:
- The nucleophile (I-) attacks the carbon attached to the oxygen, leading to the displacement of the leaving group (the other alkyl group).
- The \( S_N2 \) mechanism is characterized by a single concerted step where the nucleophile attacks from the opposite side of the leaving group, leading to inversion of configuration.

5. **Conclusion:**
- Both the assertion and the reason are correct. Methoxy ethane does indeed react with HI to produce ethanol and iodomethane, and the reaction follows an \( S_N2 \) mechanism due to steric hindrance considerations.

### Final Answer:
Both the assertion and the reason are correct, and the reason correctly explains the assertion.

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