Which of the following will show geometrical isomerism ?

Options

A. `CH_(3)-overset(C_(2)H_(5))overset(|)(C)=CH_(2)`
B. `[Pt(NH_(3))_(2)Cl_(2)]`
C. `[Cr(NH_(3))_(4)Cl_(2)]^(o+)`
D.

Explanation

To determine which of the given compounds exhibit geometrical isomerism, we will analyze each option step by step.

### Step 1: Understand Geometrical Isomerism
Geometrical isomerism, also known as cis-trans isomerism, occurs in compounds with restricted rotation around a bond, typically a double bond or in certain coordination complexes. It arises when two or more substituents are arranged differently in space.

### Step 2: Analyze Each Option

#### Option A: C=C H H CH3 C2H5
- This compound has a double bond between two carbon atoms (C=C).
- The substituents on the double bond are H, H, CH3, and C2H5.
- Since both substituents on one carbon are the same (H and H), this compound cannot exhibit geometrical isomerism.
- **Conclusion**: Does not show geometrical isomerism.

#### Option B: Pt(NH3)2Cl2
- This is a square planar complex.
- The structure can be represented as:
```
Cl
|
NH3-Pt-NH3
|
Cl
```
- In this arrangement, the two Cl groups can be on the same side (cis) or on opposite sides (trans).
- **Conclusion**: Shows geometrical isomerism.

#### Option C: [Cr(NH3)4Cl2]+
- This is an octahedral complex.
- The possible arrangements can be:
1. Both Cl groups on the same side (cis).
2. Both Cl groups on opposite sides (trans).
- The structure can be visualized as:
```
NH3
|
NH3-Cr-Cl
|
Cl
|
NH3
```
- **Conclusion**: Shows geometrical isomerism.

#### Option D: C2H4Cl2
- This compound has a double bond between two carbon atoms.
- The substituents are Cl and H on each carbon.
- The two Cl atoms can be on the same side (cis) or on opposite sides (trans).
- **Conclusion**: Shows geometrical isomerism.

### Final Conclusion
The compounds that show geometrical isomerism are:
- Option B: Pt(NH3)2Cl2
- Option C: [Cr(NH3)4Cl2]+
- Option D: C2H4Cl2

### Summary of Results
- **Option A**: Does not show geometrical isomerism.
- **Option B**: Shows geometrical isomerism.
- **Option C**: Shows geometrical isomerism.
- **Option D**: Shows geometrical isomerism.

### Final Answer
Options B, C, and D show geometrical isomerism.

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