`[Pt(NH_(3))_(4)][CuCl_(4)]` and `[Cu(NH_(3))_(4)][PtCl_(4)]` are known as

Options

A. ionisation isomers
B. coordination isomers
C. linkage isomers
D. polymerisation isomers.

Answer

To determine the correct classification of the complexes `[Pt(NH₃)₄][CuCl₄]` and `[Cu(NH₃)₄][PtCl₄]`, we need to analyze the types of isomers in coordination compounds.

### Step-by-Step Solution:

1. **Identify the Complexes**:
- The first complex is `[Pt(NH₃)₄][CuCl₄]`.
- The second complex is `[Cu(NH₃)₄][PtCl₄]`.

2. **Understand Coordination Compounds**:
- Coordination compounds consist of a central metal atom or ion bonded to surrounding ligands. The arrangement and type of ligands can lead to different isomers.

3. **Types of Isomers**:
- **Ionization Isomers**: These are isomers that have the same molecular formula but produce different ions in solution.
- **Coordination Isomers**: These occur when the composition of the coordination sphere (the central metal and its ligands) differs between isomers. This typically happens in complexes that contain both cationic and anionic parts.
- **Linkage Isomers**: These involve the same molecular formula but differ in the way ligands are attached to the metal ion.
- **Polymerization Isomers**: This term is not commonly used in coordination chemistry and does not apply here.

4. **Analyze the Given Complexes**:
- In the first complex, the platinum (Pt) is coordinated to four ammonia (NH₃) ligands, while the copper (Cu) is coordinated to four chloride (Cl) ligands.
- In the second complex, the copper is coordinated to four ammonia (NH₃) ligands, and platinum is coordinated to four chloride (Cl) ligands.
- The key point is that the ligands are distributed differently between the two complexes, even though the overall composition remains the same.

5. **Conclusion**:
- Since the ligands are distributed differently between the cationic and anionic parts of the complexes, these compounds are classified as **coordination isomers**.

### Final Answer:
The complexes `[Pt(NH₃)₄][CuCl₄]` and `[Cu(NH₃)₄][PtCl₄]` are known as **coordination isomers**.