Assertion:- Square planar complex do not show geometrical
isomerism.
Reason:- all peripheral atoms are not present in same plane.

Options

A. If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.
B. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion `&` Reason are False.

Answer

To solve the assertion and reason question, we need to analyze both statements carefully.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Square planar complexes do not show geometrical isomerism."
- Square planar complexes can exhibit geometrical isomerism, particularly when they have different ligands. For example, complexes of the type MA2B2 can exist in both cis and trans forms, indicating that they can show geometrical isomerism.

**Hint**: Recall that geometrical isomerism occurs when ligands can occupy different positions around the central atom.

2. **Understanding the Reason**:
- The reason states that "All peripheral atoms are not present in the same plane."
- In square planar complexes, all peripheral atoms (ligands) are indeed in the same plane. This is a characteristic feature of square planar geometry, where the ligands are arranged at 90-degree angles to each other in a flat plane.

**Hint**: Consider the definition of square planar geometry and how ligands are arranged around the central atom.

3. **Evaluating the Truth of Each Statement**:
- Since the assertion is false (square planar complexes can show geometrical isomerism), and the reason is also false (all peripheral atoms are in the same plane), we conclude that both statements are incorrect.

**Hint**: Assess the definitions and examples of square planar complexes to determine their properties.

4. **Conclusion**:
- Both the assertion and reason are false. Therefore, the correct answer is that both statements are incorrect.

### Final Answer:
Both the assertion and the reason are false.

---