Assertion : The major product formed by heating `C_(6)H_(5)CH_(2)OC_(2)H_(5)` with HI are `C_(6)H_(5)CH_(2)I and C_(2)H_(5)OH.`
Reason : Benzyl cation is more stale than ethyl cation.

Options

A. If both assertion and reason are correct and reason is correct explanation for assertion.
B. If both assertion and reason are correct but reason is not correct for assertion.
C. If assertion is correct but reason is incorrect.
D. If both assertion and reason are incorrect.

Explanation

To solve the question, we need to analyze the assertion and reason provided regarding the reaction of benzyl ethyl ether with hydroiodic acid (HI).

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactant given is benzyl ethyl ether, which can be represented as \( C_6H_5CH_2OC_2H_5 \).

2. **Understanding the Reaction with HI**:
When benzyl ethyl ether is heated with HI, the ether undergoes protonation. The oxygen atom in the ether has lone pairs that can attract the hydrogen ion (H⁺) from HI, forming an oxonium ion.

3. **Formation of the Oxonium Ion**:
The reaction can be represented as:
\[ C_6H_5CH_2OC_2H_5 + H^+ \rightarrow C_6H_5CH_2OH^+C_2H_5 \]
Here, the ether is protonated, resulting in the formation of an oxonium ion.

4. **Cleavage of the Carbon-Oxygen Bond**:
The next step involves the cleavage of the carbon-oxygen bond in the oxonium ion. This cleavage can proceed via an SN1 mechanism, which is favored due to the stability of the resulting carbocations.

5. **Stability of Carbocations**:
The reaction will yield two possible carbocations: a benzyl cation (\( C_6H_5CH_2^+ \)) and an ethyl cation (\( C_2H_5^+ \)). The benzyl cation is more stable than the ethyl cation due to resonance stabilization.

6. **Formation of Products**:
The more stable benzyl cation will form when the bond between the benzyl group and the ether oxygen breaks. The products formed are:
- Benzyl iodide (\( C_6H_5CH_2I \)) from the attack of iodide ion (I⁻) on the benzyl cation.
- Ethanol (\( C_2H_5OH \)) from the cleavage of the ether.

7. **Conclusion**:
Therefore, the major products formed from the reaction of benzyl ethyl ether with HI are benzyl iodide and ethanol, confirming the assertion.

### Final Answer:
Both the assertion and reason are correct, and the reason is the correct explanation for the assertion.