Assertion (A)Geometrical isomerism arises in heteroleptic complexes.
Reason( R) Different geometric arrangements of the ligands are possible.

Options

A. Both Assertion and Reason are correct and Reason is the correct explanation of the correct explanation of the Assertion
B. Both Assertion and Reason are correct explanation of Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are Incorrect

Answer

To analyze the given assertion and reason, we will break down the concepts of geometrical isomerism and heteroleptic complexes step by step.

### Step 1: Understanding the Assertion
The assertion states that "Geometrical isomerism arises in heteroleptic complexes."

**Explanation**:
- Heteroleptic complexes are coordination compounds that contain two or more different types of ligands. For example, a complex with the formula [MA4B2] has four ligands of type A and two ligands of type B.
- Geometrical isomerism occurs when there are different spatial arrangements of the ligands around the central metal atom. This is particularly relevant in octahedral and square planar complexes.

**Hint**: Identify the types of complexes that can exhibit geometrical isomerism.

### Step 2: Understanding the Reason
The reason states that "Different geometric arrangements of the ligands are possible."

**Explanation**:
- In heteroleptic complexes, the different types of ligands can occupy different positions around the metal center. For example, in an octahedral complex, ligands can be arranged in a cis (adjacent) or trans (opposite) configuration.
- This ability to arrange ligands in different spatial orientations leads to the formation of geometrical isomers.

**Hint**: Consider how the arrangement of ligands affects the overall structure of the complex.

### Step 3: Conclusion
Both the assertion and the reason are true. The assertion correctly states that geometrical isomerism arises in heteroleptic complexes, and the reason correctly explains that this is due to the possibility of different geometric arrangements of the ligands.

**Final Answer**:
- Assertion (A) is true.
- Reason (R) is true, and it correctly explains assertion (A).