Which of the following can exhibit geometrical isomerism

Options

A. `[MnBr_(4)]^(2-)`
B. `[Pt(NH_(3))_(3)Cl]^(+)`
C. `[PtCl_(2).P(C_(2)H_(5))_(3)]_(2)`
D. `[Fe(H_(2)O)_(5)NO]^(2+)`

Explanation

To determine which of the given complexes can exhibit geometrical isomerism, we need to analyze the coordination geometry and the arrangement of ligands around the central metal atom. Geometrical isomerism typically occurs in coordination compounds with specific geometries, such as square planar and octahedral, where ligands can occupy different spatial arrangements.

### Step-by-Step Solution:

1. **Understanding Geometrical Isomerism**:
- Geometrical isomerism occurs when ligands occupy different positions around a central metal atom, leading to different spatial arrangements.
- The most common types of geometrical isomers are cis and trans forms.

2. **Analyzing the First Complex: MnBr4^2-**:
- Manganese (Mn) in this complex has an oxidation state of +2.
- The coordination number is 4, leading to a tetrahedral geometry.
- Tetrahedral complexes do not exhibit geometrical isomerism because all positions are equivalent.
- **Conclusion**: MnBr4^2- does not exhibit geometrical isomerism.

3. **Analyzing the Second Complex: [Pt(NH3)3Cl]+**:
- Platinum (Pt) in this complex has an oxidation state of +2.
- The coordination number is 4, leading to a square planar geometry.
- Square planar complexes can exhibit geometrical isomerism (cis and trans).
- **Conclusion**: [Pt(NH3)3Cl]+ can exhibit geometrical isomerism.

4. **Analyzing the Third Complex: [PtCl2(PC2H5)3]**:
- Again, platinum (Pt) has an oxidation state of +2.
- The coordination number is 4, leading to a square planar geometry.
- This complex can also exhibit geometrical isomerism (cis and trans).
- **Conclusion**: [PtCl2(PC2H5)3] can exhibit geometrical isomerism.

5. **Analyzing the Fourth Complex: [Fe(H2O)5(NH3)]^2+**:
- Iron (Fe) in this complex has an oxidation state of +2.
- The coordination number is 6, leading to an octahedral geometry.
- Octahedral complexes can exhibit geometrical isomerism (facial and meridional).
- **Conclusion**: [Fe(H2O)5(NH3)]^2+ can exhibit geometrical isomerism.

### Final Answer:
The complexes that can exhibit geometrical isomerism are:
- [Pt(NH3)3Cl]+
- [PtCl2(PC2H5)3]
- [Fe(H2O)5(NH3)]^2+