### Understanding Isomerism in Coordination Compounds

1. **Isomerism Overview**: Isomerism refers to the phenomenon where compounds with the same molecular formula exhibit different structural or spatial arrangements.

2. **Types of Isomerism**: In coordination chemistry, isomerism can be broadly classified into two main categories: structural isomerism and stereoisomerism.

3. **Specific Types Related to the Given Complex**:
- **Structural Isomerism**: This occurs when the connectivity of the ligands differs. In the case of [Co(NH3)5(NO2)]Cl2, the complex could exhibit functional isomerism (different types of bonding of the nitro group like nitro vs. nitrito).
- **Stereoisomerism**: This refers to isomers that have the same connectivity but differ in the arrangement of atoms in space. The complex could show geometrical isomerism due to the arrangement of the ligands around the cobalt center.

4. **Conclusion on Color Difference**: The difference in color between the yellow and red forms of [Co(NH3)5(NO2)]Cl2 is likely attributed to **geometrical isomerism** (cis-trans isomerism), where the positioning of the ligands affects the electronic distribution and, consequently, the color of the complex.

### Final Answer
The difference in colour of the complex [Co(NH3)5(NO2)]Cl2 is attributed to **geometrical isomerism**.

Question

### Understanding Isomerism in Coordination Compounds

1. **Isomerism Overview**: Isomerism refers to the phenomenon where compounds with the same molecular formula exhibit different structural or spatial arrangements.

2. **Types of Isomerism**: In coordination chemistry, isomerism can be broadly classified into two main categories: structural isomerism and stereoisomerism.

3. **Specific Types Related to the Given Complex**:
   - **Structural Isomerism**: This occurs when the connectivity of the ligands differs. In the case of [Co(NH3)5(NO2)]Cl2, the complex could exhibit functional isomerism (different types of bonding of the nitro group like nitro vs. nitrito).
   - **Stereoisomerism**: This refers to isomers that have the same connectivity but differ in the arrangement of atoms in space. The complex could show geometrical isomerism due to the arrangement of the ligands around the cobalt center.

4. **Conclusion on Color Difference**: The difference in color between the yellow and red forms of [Co(NH3)5(NO2)]Cl2 is likely attributed to **geometrical isomerism** (cis-trans isomerism), where the positioning of the ligands affects the electronic distribution and, consequently, the color of the complex.

### Final Answer
The difference in colour of the complex [Co(NH3)5(NO2)]Cl2 is attributed to **geometrical isomerism**.

Knowee AI · Accepted Answer

### Understanding Isomerism in Coordination Compounds

1. **Isomerism Overview**: Isomerism refers to the phenomenon where compounds with the same molecular formula exhibit different structural or spatial arrangements.

2. **Types of Isomerism**: In coordination chemistry, isomerism can be broadly classified into two main categories: structural isomerism and stereoisomerism.

3. **Specific Types Related to the Given Complex**:
   - **Structural Isomerism**: This occurs when the connectivity of the ligands differs. In the case of [Co(NH3)5(NO2)]Cl2, the complex could exhibit functional isomerism (different types of bonding of the nitro group like nitro vs. nitrito).
   - **Stereoisomerism**: This refers to isomers that have the same connectivity but differ in the arrangement of atoms in space. The complex could show geometrical isomerism due to the arrangement of the ligands around the cobalt center.

4. **Conclusion on Color Difference**: The difference in color between the yellow and red forms of [Co(NH3)5(NO2)]Cl2 is likely attributed to **geometrical isomerism** (cis-trans isomerism), where the positioning of the ligands affects the electronic distribution and, consequently, the color of the complex.

### Final Answer
The difference in colour of the complex [Co(NH3)5(NO2)]Cl2 is attributed to **geometrical isomerism**.

The complex [Co(NH3 )5 (NO2 )]Cl2 is obtained in yellow and red coloured forms . The differencein colour is attributed to the following type of isomerism

Question

The complex `Co(NH3 )5 (NO2 )Cl2` is obtained in yellow and red coloured forms. The difference in colour is attributed to the following type of isomerism.

Solution