Type of isomerism shown by complex `[Co(NH_(3))_(5)NO_(2)]Cl` is

Options

A. Linkage and geometrical
B. Linkage only
C. Linkage and ionisation
D. Ionisation only

Explanation

To determine the type of isomerism shown by the complex \([Co(NH_3)_5NO_2]Cl\), we will analyze the possible types of isomerism that can occur in coordination compounds.

### Step-by-Step Solution:

1. **Identify the Ligands and Their Arrangement**:
The complex \([Co(NH_3)_5NO_2]Cl\) consists of five ammonia (NH3) ligands and one nitrito (NO2) ligand. The nitrito ligand can coordinate through either the nitrogen atom (as nitro) or the oxygen atom (as nitrito).

**Hint**: Look for ligands that can attach in different ways.

2. **Determine the Coordination Number and Geometry**:
The cobalt (Co) in this complex has a coordination number of 6 (5 from NH3 and 1 from NO2). This typically results in an octahedral geometry.

**Hint**: Remember that coordination number helps in determining the geometry of the complex.

3. **Consider Types of Isomerism**:
The main types of isomerism in coordination compounds include:
- **Geometrical Isomerism** (cis-trans)
- **Linkage Isomerism**
- **Ionization Isomerism**
- **Stereoisomerism**

**Hint**: Familiarize yourself with the definitions of each type of isomerism.

4. **Evaluate Geometrical Isomerism**:
Geometrical isomerism (cis-trans) requires at least two identical ligands. In this case, there are no identical ligands present, so geometrical isomerism does not apply.

**Hint**: Check for identical ligands to determine if geometrical isomerism is possible.

5. **Evaluate Linkage Isomerism**:
Linkage isomerism occurs when a ligand can bind through different atoms. In this case, the nitrito ligand (NO2) can bind through either nitrogen or oxygen, leading to different structural forms of the complex.

**Hint**: Look for ligands that can attach through different atoms.

6. **Evaluate Ionization Isomerism**:
Ionization isomerism occurs when the complex can produce different ions in solution. However, in this case, the complex does not show different ions upon dissociation, as the chloride ion remains constant.

**Hint**: Consider whether the complex can produce different ions in solution.

7. **Conclusion**:
The complex \([Co(NH_3)_5NO_2]Cl\) exhibits linkage isomerism due to the ability of the nitrito ligand to coordinate through different atoms (N or O).

### Final Answer:
The type of isomerism shown by the complex \([Co(NH_3)_5NO_2]Cl\) is **linkage isomerism**.