Assertion : When Alkyl aryl ethers react with excess of hydrogen halides, phenol and Alkyl halide are produced. Reason: Alkyl aryl ethers are cleaved at the Alkyl-oxygen bond due to more stable Aryl-oxygen bond.

Options

A. if both assertioon and reason are true and reason is the corrct explanation of assertion.
B. If both assertion and reason are ture but reason is not the corrcet explanation of assertion.
C. If assertion is true but reason is false .
D. if both assertion and reason are false.

Answer

To solve the question, we need to analyze the assertion and reason provided regarding the reaction of alkyl aryl ethers with hydrogen halides.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
The assertion states that when alkyl aryl ethers react with excess hydrogen halides, they produce phenol and an alkyl halide.
- For example, consider the ether anisole (C6H5OCH3) reacting with HBr. The products of this reaction would be phenol (C6H5OH) and bromoethane (CH3Br).

2. **Understanding the Reason**:
The reason provided states that alkyl aryl ethers are cleaved at the alkyl-oxygen bond due to the more stable aryl-oxygen bond.
- In ethers, the bond between the aryl group (C6H5) and oxygen is stronger and more stable compared to the bond between the alkyl group (CH3) and oxygen. Thus, during the reaction with hydrogen halides, the alkyl-oxygen bond is broken preferentially.

3. **Mechanism of Reaction**:
- When the ether reacts with hydrogen halide, the oxygen atom in the ether donates its lone pair to the hydrogen ion (H+), resulting in a protonated ether.
- The protonated ether then undergoes nucleophilic attack by the halide ion (Br-), which attacks the less sterically hindered side (the alkyl side), leading to the cleavage of the alkyl-oxygen bond.
- This results in the formation of phenol and the corresponding alkyl halide.

4. **Conclusion**:
- Both the assertion and the reason are correct. The assertion correctly describes the products formed when alkyl aryl ethers react with hydrogen halides, and the reason correctly explains the mechanism behind the reaction.

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