Which one of the following pair represents stereo isomerism :-

Options

A. Linkage isomerism and Geometrical isomerism
B. Chain isomerism and Rotational isomerism
C. Optical isomerism and Geometrical isomerism
D. Structural isomerism and Geometrical isomerism

Answer

To determine which pair represents stereoisomerism, we need to understand the types of isomerism and specifically focus on stereoisomerism.

### Step-by-Step Solution:

1. **Understand Isomerism**: Isomerism is the phenomenon where two or more compounds have the same molecular formula but different structures or spatial arrangements. It is primarily divided into two categories: structural isomerism and stereoisomerism.

2. **Identify Types of Isomerism**:
- **Structural Isomerism**: This includes chain isomerism, positional isomerism, functional group isomerism, and metamerism.
- **Stereoisomerism**: This is further divided into optical isomerism and geometrical isomerism.

3. **Analyze the Options**: Look at the given pairs in the question. We need to identify which pair falls under stereoisomerism.
- **Linkage Isomerism**: This is a type of structural isomerism.
- **Geometrical Isomerism**: This is a type of stereoisomerism.
- **Rotational Isomerism**: This is related to conformational isomerism, which is also not stereoisomerism.

4. **Determine the Correct Pair**: Since geometrical isomerism is a type of stereoisomerism, any pair that includes geometrical isomerism would represent stereoisomerism. Optical isomerism is also a type of stereoisomerism.

5. **Conclusion**: The correct answer is the pair that includes geometrical isomerism or optical isomerism, as both belong to the category of stereoisomerism.

### Final Answer:
The pair that represents stereoisomerism includes geometrical isomerism and optical isomerism.

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