Why is geometrical isomerism not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with central metal ion ? .

Explanation

To answer the question of why geometrical isomerism is not possible in tetrahedral complexes with two different types of unidentate ligands coordinated to a central metal ion, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Tetrahedral Geometry**:
- Tetrahedral complexes have a central metal ion surrounded by four ligands arranged at the corners of a tetrahedron. The bond angles in a tetrahedral complex are approximately 109.5 degrees.

2. **Definition of Unidentate Ligands**:
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