Assertion . The resonance hybrid is more stable than any of the contributing structure .
Reason . The contributing structures contain the same number of umpaired elelctrons and have the real existance.

Options

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

Explanation

To analyze the assertion and reason provided in the question, we will break down the concepts of resonance hybrid and contributing structures step by step.

### Step 1: Understanding the Assertion
**Assertion:** The resonance hybrid is more stable than any of the contributing structures.

- **Explanation:** In resonance theory, the resonance hybrid represents the actual structure of a molecule, which is a combination of all possible contributing structures (or resonance forms). The stability of the resonance hybrid arises from the delocalization of electrons across multiple bonds, which lowers the overall energy of the molecule compared to any single contributing structure.

### Step 2: Understanding the Reason
**Reason:** The contributing structures contain the same number of unpaired electrons and have real existence.

- **Explanation:** Contributing structures are hypothetical representations of a molecule that help in visualizing the distribution of electrons. While they may have the same number of unpaired electrons, they do not represent the actual structure of the molecule. Instead, they are used to illustrate how electrons can be distributed in different ways. The resonance hybrid, on the other hand, is a real entity that reflects the actual electron distribution in the molecule.

### Step 3: Evaluating the Relationship Between Assertion and Reason
- Both the assertion and reason are correct statements. However, the reason does not adequately explain why the resonance hybrid is more stable than the contributing structures. The stability of the resonance hybrid is primarily due to the delocalization of electrons, which is not addressed in the reason provided.

### Conclusion
- **Final Evaluation:** The assertion is correct, and the reason is also correct, but the reason does not serve as the correct explanation for the assertion. Therefore, the correct answer to the question is that both statements are true, but the reason is not the correct explanation for the assertion.