Which of the following will not show optical isomerism as well as geometrical isomerism ?

Options

A.
B.
C.
D.

Explanation

To determine which compound does not show optical isomerism as well as geometrical isomerism, we need to analyze the characteristics of each compound based on the definitions of these types of isomerism.

### Step-by-Step Solution:

1. **Understanding Geometrical Isomerism**:
- Geometrical isomerism occurs in compounds with a carbon-carbon double bond (C=C) where there are different groups attached to the carbons. The presence of dissimilar groups allows for cis-trans (or E/Z) configurations.

2. **Understanding Optical Isomerism**:
- Optical isomerism arises when a compound lacks a plane of symmetry and has a chiral center (an atom bonded to four different groups). Such compounds can exist in two non-superimposable mirror images (enantiomers).

3. **Analyzing Each Compound**:
- **Compound A**: Contains dissimilar groups around the double bond and lacks a plane of symmetry. Therefore, it can show both geometrical and optical isomerism.
- **Compound B**: Has two identical groups attached to one carbon in the double bond, which means it cannot show geometrical isomerism. However, it lacks a plane of symmetry, so it can show optical isomerism.
- **Compound C**: Similar to compound B, it has two similar groups around the double bond but different groups on the other carbon. It cannot show geometrical isomerism due to the identical groups but can show optical isomerism as it lacks a plane of symmetry.
- **Compound D**: Contains two similar groups around both carbons in the double bond. This means it cannot show geometrical isomerism. Additionally, it has a plane of symmetry that bisects the molecule, indicating that it cannot show optical isomerism either.

4. **Conclusion**:
- After analyzing all compounds, we find that **Compound D** does not exhibit either optical or geometrical isomerism due to the presence of a plane of symmetry and identical groups around the double bond.

### Final Answer:
The compound that does not show optical isomerism as well as geometrical isomerism is **Option D**.

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