The `CI - C - CI` angle in `1, 1, 2, 2`, tetrachloroethone and tetrachloromethane respectively will be about:

Options

A. `109.5^(@)` and `90^(@)`
B. `120^(@)` and `109.5^(@)`
C. `90^(@)` and `109.5^(@)`
D. `109.5^(@)` and `120^(@)`

Answer

To determine the `C-Cl-C` angle in 1,1,2,2-tetrachloroethane and tetrachloromethane, we need to analyze the molecular structures of both compounds and their hybridization states.

### Step-by-Step Solution:

1. **Identify the Structure of 1,1,2,2-tetrachloroethane**:
- The name indicates that we have an ethane backbone (C-C) with chlorine atoms attached.
- The structure can be represented as:
```
Cl Cl
| |
C=C
| |
Cl Cl
```
- In this structure, each carbon atom (C) is bonded to two chlorine (Cl) atoms.

2. **Determine the Hybridization of Carbon in 1,1,2,2-tetrachloroethane**:
- Each carbon atom in this compound is involved in a double bond (C=C), which means they are **sp² hybridized**.
- The bond angles in sp² hybridization are approximately **120 degrees**.

3. **Identify the Structure of Tetrachloromethane**:
- Tetrachloromethane (CCl₄) has a central carbon atom bonded to four chlorine atoms.
- The structure can be represented as:
```
Cl
|
Cl--C--Cl
|
Cl
```
- Here, the carbon atom is surrounded by four chlorine atoms.

4. **Determine the Hybridization of Carbon in Tetrachloromethane**:
- The carbon atom in tetrachloromethane is bonded to four chlorine atoms, which means it is **sp³ hybridized**.
- The bond angles in sp³ hybridization are approximately **109.5 degrees**.

5. **Conclusion**:
- The `C-Cl-C` angle in 1,1,2,2-tetrachloroethane is about **120 degrees**.
- The `C-Cl-C` angle in tetrachloromethane is about **109.5 degrees**.

### Final Answer:
- The `C-Cl-C` angle in 1,1,2,2-tetrachloroethane is approximately **120 degrees**, while in tetrachloromethane, it is approximately **109.5 degrees**.