Which of the following halides of carbon are solids?

Options

A. `CF_(4)`
B. `C Cl_(4)`
C. `CBr_(4)`
D. `Cl_(4)`

Answer

To determine which halides of carbon are solids, we will analyze each option provided in the question. The halides of carbon we will consider are:

1. **CF₄ (Carbon Tetrafluoride)**
2. **CCl₄ (Carbon Tetrachloride)**
3. **CBr₄ (Carbon Tetrabromide)**
4. **CI₄ (Carbon Tetraiodide)**

### Step-by-Step Solution:

1. **Analyzing CF₄ (Carbon Tetrafluoride)**:
- CF₄ is known to be a gas at room temperature.
- Therefore, CF₄ is **not a solid**.

2. **Analyzing CCl₄ (Carbon Tetrachloride)**:
- CCl₄ is also a gas at room temperature.
- Hence, CCl₄ is **not a solid**.

3. **Analyzing CBr₄ (Carbon Tetrabromide)**:
- CBr₄ is a crystalline solid.
- It has a higher molecular weight and stronger dispersion forces compared to CF₄ and CCl₄, which allows it to exist as a solid at room temperature.
- Therefore, CBr₄ is **a solid**.

4. **Analyzing CI₄ (Carbon Tetraiodide)**:
- CI₄ is also a crystalline solid.
- Similar to CBr₄, it has significant dispersion forces due to its larger size and molecular weight.
- Thus, CI₄ is **a solid**.

### Conclusion:
The halides of carbon that are solids are **CBr₄ (Carbon Tetrabromide)** and **CI₄ (Carbon Tetraiodide)**.

### Final Answer:
- The correct options are **CBr₄ and CI₄**.