Which one of the following complex is not expected to exhibit isomerism

Options

A. `[Ni(NH_(3))_(4)(H_(2)O)_(2)]^(2+)`
B. `[Ni(en)_(3)]^(2+`
C. `[Pt(NH_(3))_(2)Cl_(2))]`
D. `[Ni(NH_(3))_(2)Cl_(2)]`

Explanation

To determine which complex does not exhibit isomerism, we will analyze each complex in terms of geometrical and optical isomerism.

### Step 1: Understand Isomerism in Coordination Complexes
Isomerism in coordination complexes can be classified into two main types:
- **Geometrical Isomerism**: Occurs when ligands can be arranged differently in space (e.g., cis and trans forms).
- **Optical Isomerism**: Occurs when a complex can exist in two non-superimposable mirror images.

### Step 2: Analyze Each Complex
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