Which of the following shows geometrical isomers ?

Options

A. `BrCH=C=C=CHBr`
B. `BrCH=C=C=CBr`
C. `CH_(2)=C=C=CHBr`
D.

Explanation

To determine which of the given compounds shows geometrical isomers, we need to analyze each option based on the presence of a double bond and the different substituents attached to the carbon atoms involved in that double bond. Geometrical isomers, also known as cis-trans isomers, occur when there are two different groups attached to each carbon of the double bond.

### Step-by-Step Solution:

1. **Understanding Geometrical Isomers**:
- Geometrical isomers occur in compounds with a carbon-carbon double bond (C=C) when there are different substituents attached to the carbon atoms of the double bond. 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.

2. **Analyzing Compound A**:
- Compound A has a structure with a carbon double bond and different substituents (H and Br) on both carbons.
- It can exhibit cis (H on the same side) and trans (H on opposite sides) configurations.
- **Conclusion**: Compound A shows geometrical isomers.

3. **Analyzing Compound B**:
- Compound B also has a carbon double bond, but it has two bromine atoms (Br) on one carbon.
- Since both substituents are the same (Br), it cannot exhibit cis-trans isomerism.
- **Conclusion**: Compound B does not show geometrical isomers.

4. **Analyzing Compound C**:
- Compound C has a carbon double bond with two identical hydrogen atoms attached to one of the carbons.
- Since both substituents are the same (H), it cannot exhibit cis-trans isomerism.
- **Conclusion**: Compound C does not show geometrical isomers.

5. **Analyzing Compound D**:
- Compound D features a cyclohexane ring with a double bond and different substituents (Cl and Me) attached to the carbons involved in the double bond.
- It can exhibit cis (Cl and Me on the same side) and trans (Cl and Me on opposite sides) configurations.
- **Conclusion**: Compound D shows geometrical isomers.

### Final Answer:
- The compounds that show geometrical isomers are **Compound A and Compound D**.