The relationship between `[Co(NH_3)_4Cl_2]NO_2 and [CO(NH_3)_4Cl.NO_2]Cl` isomers is

Options

A. Linkage
B. Geometrical
C. Ionization
D. Optical

Answer

To determine the relationship between the coordination compounds `[Co(NH_3)_4Cl_2]NO_2` and `[Co(NH_3)_4Cl.NO_2]Cl`, we need to analyze their structures and the nature of their components.

### Step-by-Step Solution:

1. **Identify the Components of Each Compound**:
- The first compound, `[Co(NH_3)_4Cl_2]NO_2`, consists of a cobalt ion coordinated with four ammonia ligands and two chloride ions, with a nitrite ion as a counter ion.
- The second compound, `[Co(NH_3)_4Cl.NO_2]Cl`, has a similar coordination sphere with four ammonia ligands and one chloride ion, but here the nitrite ion is coordinated as a ligand, and there is an additional chloride ion as a counter ion.

2. **Determine the Nature of the Isomers**:
- The difference in the arrangement of the nitrite ion and chloride ion indicates that these compounds are isomers. Specifically, the nitrite ion acts as a ligand in one compound and as a counter ion in the other.
- This type of isomerism is known as **ionization isomerism**, where the same molecular formula can lead to different ions when dissolved in a solution.

3. **Conclusion**:
- The relationship between the two compounds is that they are **ionization isomers**. This means they differ in the way their ligands and counter ions are arranged, leading to different ionic forms in solution.

### Final Answer:
The relationship between `[Co(NH_3)_4Cl_2]NO_2` and `[Co(NH_3)_4Cl.NO_2]Cl` is that they are **ionization isomers**.