A : Borazine is more reactive than benzene .
R : Borazine is isostructural with benzene

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)
C. If Assertion is true statement but Reason is false , then mark (3)
D. If both Assertion and Reason are false statements , then mark (4)

Answer

To solve the assertion-reason question regarding borazine and benzene, we will analyze both the assertion (A) and the reason (R) step by step.

### Step 1: Understanding the Assertion
**Assertion (A): Borazine is more reactive than benzene.**

- **Explanation**: Borazine, also known as inorganic benzene, has the chemical formula B3N3H6. Its structure consists of alternating boron (B) and nitrogen (N) atoms in a cyclic arrangement, with hydrogen (H) atoms attached. The bonds between boron and nitrogen are polar due to the difference in electronegativity between the two elements. This polarity contributes to the higher reactivity of borazine compared to benzene.

### Step 2: Understanding the Reason
**Reason (R): Borazine is isostructural with benzene.**

- **Explanation**: Both borazine and benzene have a similar cyclic structure. Benzene is composed entirely of carbon atoms (C6H6) arranged in a hexagonal ring with alternating double bonds. Borazine has a similar hexagonal shape but consists of alternating boron and nitrogen atoms. Because of this structural similarity, borazine is considered isostructural with benzene.

### Step 3: Evaluating the Relationship Between A and R
- **Correctness of A**: The assertion is correct because borazine is indeed more reactive than benzene due to the polar nature of its B-N bonds.
- **Correctness of R**: The reason is also correct as borazine and benzene share a similar structural arrangement.
- **Explanation Validity**: However, the reason provided does not explain why borazine is more reactive than benzene. The reason focuses on structural similarity rather than the difference in bond polarity that accounts for the difference in reactivity.

### Conclusion
- **Final Answer**: Both the assertion and the reason are correct, but the reason is not the correct explanation of the assertion.