Geometric isomers would be expected for which of the following compounds

Options

A. `[Zn(NH_(3))_(4)]^(2+)`
B. `[Pt(NH_(3))_(2)Cl_(2)]`
C. `[Pt(NH_(3))_(3)Cl]^(+)`
D. `K_(2)[CuCl_(4)]`

Answer

To determine which of the given compounds can exhibit geometric isomerism, we will analyze each compound step by step.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- The compounds given are:
1. \( \text{[Zn(NH}_3\text{)}_4]^{2+} \)
2. \( \text{[Pt(NH}_3\text{)}_2\text{Cl}_2] \)
3. \( \text{[Pt(NH}_3\text{)}_3\text{Cl}]^{+} \)
4. \( \text{[M(NH}_3\text{)}_4] \) (assumed to be a hypothetical complex with four identical ligands)

2. **Analyze the First Compound: \( \text{[Zn(NH}_3\text{)}_4]^{2+} \)**
- Zinc (Zn) is a d-block metal and has a coordination number of 4.
- The ligands are all the same (ammonia).
- Since all ligands are identical, there are no different arrangements possible.
- **Conclusion:** This compound does not exhibit geometric isomerism.

3. **Analyze the Second Compound: \( \text{[Pt(NH}_3\text{)}_2\text{Cl}_2] \)**
- Platinum (Pt) is also a d-block metal and has a coordination number of 4.
- There are two types of ligands: 2 ammonia (A) and 2 chloride (B).
- The possible arrangements can be cis (where A's are adjacent) and trans (where A's are opposite).
- **Conclusion:** This compound can exhibit geometric isomerism.

4. **Analyze the Third Compound: \( \text{[Pt(NH}_3\text{)}_3\text{Cl}]^{+} \)**
- Here, we have 3 ammonia (A) and 1 chloride (B).
- The arrangement of ligands does not allow for different spatial arrangements since the B ligand can only occupy one position relative to the three A ligands.
- **Conclusion:** This compound does not exhibit geometric isomerism.

5. **Analyze the Fourth Compound: \( \text{[M(NH}_3\text{)}_4] \) (hypothetical)**
- Similar to the first compound, all four ligands are identical (ammonia).
- There are no different arrangements possible.
- **Conclusion:** This compound does not exhibit geometric isomerism.

### Final Answer:
The compound that can exhibit geometric isomerism is:
- \( \text{[Pt(NH}_3\text{)}_2\text{Cl}_2] \)