Assertion : Same number of electron pairs are present in resonance structures.
Reason : Resonance structures differ in the location of electrons around the constituent atoms.

Options

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

Explanation

To analyze the given assertion and reason, we will break down the concepts of resonance structures in organic chemistry.

### Step-by-Step Solution:

1. **Understanding Resonance Structures**:
- Resonance structures are different ways of representing the same molecule. They illustrate how the electrons are distributed in a molecule that cannot be adequately described by a single Lewis structure.

2. **Assertion Analysis**:
- The assertion states that "the same number of electron pairs are present in resonance structures." This is true because resonance structures are different representations of the same molecule, which means they must have the same total number of electrons and electron pairs.

3. **Reason Analysis**:
- The reason states that "resonance structures differ in the location of electrons around the constituent atoms." This is also true. In resonance structures, the arrangement of electrons (especially pi electrons and lone pairs) can vary while the overall connectivity of atoms remains the same.

4. **Conclusion**:
- Since both the assertion and reason are true, and the reason provides a correct explanation for the assertion, we conclude that both statements are valid and related.

5. **Final Answer**:
- Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.