Geometrical isomerism is posible in :

Options

A. `CH_(3)CH(CH_(3))CH_(2)CH_(2)CH_(3)`
B. `CH_(3)CH=CHCH_(3)`
C. `CH_(3)CH=CH_(2)`
D. `ClH_(2)C-CH_(2)Cl`

Explanation

To determine which compound exhibits geometrical isomerism, we need to analyze the options provided based on the criteria for geometrical isomerism, which primarily occurs in alkenes with a carbon-carbon double bond (C=C). Here’s a step-by-step solution:

### Step 1: Understanding Geometrical Isomerism
Geometrical isomerism occurs when there is restricted rotation around a double bond, leading to different spatial arrangements of groups attached to the carbon atoms. The two main forms are:
- **Cis**: Similar groups are on the same side of the double bond.
- **Trans**: Similar groups are on opposite sides of the double bond.

### Step 2: Identify the Presence of a Double Bond
Geometrical isomerism is only possible in compounds that contain a carbon-carbon double bond. Therefore, we will look for alkenes (C=C) in the options provided.

### Step 3: Analyze Each Option
1. **Option 1**: No double bond present.
- Since there is no double bond, geometrical isomerism is not possible.

2. **Option 2**: Contains a double bond (C=C) with different groups attached.
- Example: C=C with H and CH3 on one side and H and CH3 on the other side.
- Here, A (CH3) is not equal to B (H), allowing for both cis and trans configurations. Therefore, geometrical isomerism is possible.

3. **Option 3**: Contains a double bond but has two identical groups.
- Example: C=C with H and H on one side and CH3 and CH3 on the other side.
- Here, A (H) is equal to B (H), which means geometrical isomerism is not possible.

4. **Option 4**: Contains only single bonds.
- Since there is no double bond, geometrical isomerism is not possible.

### Conclusion
After analyzing all options, **Option 2** is the only compound that can exhibit geometrical isomerism due to the presence of a double bond and different substituents.

### Final Answer
**Geometrical isomerism is possible in Option 2.**

---