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

Explanation

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

### Step-by-Step Solution:

1. **Definition of Tetrahedral Complexes**:
Tetrahedral complexes have a central metal atom surrounded by four ligands positioned at the corners of a tetrahedron. The bond angles between the ligands are approximately 109.5°.

2. **Types of Ligands**:
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