`[Co(en)_(2)NO_(2)Br]Cl` can exhibit

Options

A. Geometrical isomerism
B. Optical isomerism
C. Linkage isomerism
D. Ionisation isomerism

Answer

To solve the question regarding the coordination compound `[Co(en)₂NO₂Br]Cl`, we need to analyze the potential types of isomerism it can exhibit. Let's break down the solution step by step.

### Step 1: Identify the Coordination Complex
The given complex is `[Co(en)₂NO₂Br]Cl`, where:
- Co is the central metal ion (Cobalt).
- `en` is ethylenediamine, a bidentate ligand.
- `NO₂` is a nitro ligand.
- `Br` is a bromide ligand.
- `Cl` is the counter ion.

### Step 2: Determine the Types of Isomerism
We will evaluate the types of isomerism that this complex can exhibit:

1. **Geometrical Isomerism**:
- Geometrical isomerism occurs when ligands can be arranged in different spatial orientations. In this case, the `en` ligands can be positioned either adjacent (cis) or opposite (trans) to each other.
- Since there are two `en` ligands and one `NO₂` and one `Br`, the complex can exhibit cis-trans isomerism.

2. **Optical Isomerism**:
- Optical isomerism arises when a compound can exist in two non-superimposable mirror images (enantiomers).
- The presence of bidentate ligands like `en` can lead to chiral arrangements, allowing for optical isomerism.

3. **Linkage Isomerism**:
- Linkage isomerism occurs when a ligand can coordinate to the metal in more than one way.
- In this case, the `NO₂` ligand can bind through the nitrogen (forming a nitro complex) or through the oxygen (forming a nitrito complex). This gives rise to linkage isomerism.

4. **Ionization Isomerism**:
- Ionization isomerism occurs when the position of a counter ion changes between being inside or outside the coordination sphere.
- In this complex, the bromide (`Br`) can be either inside the coordination sphere or outside, leading to different ionization isomers.

### Conclusion
Based on the analysis, the complex `[Co(en)₂NO₂Br]Cl` can exhibit:
- Geometrical isomerism
- Optical isomerism
- Linkage isomerism
- Ionization isomerism

Thus, all four types of isomerism are possible for this coordination compound.