Which of the following halides of carbon are solids?

Options

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

Answer

To determine which halides of carbon are solids, we will analyze each of the given options based on their physical states at room temperature.

### Step-by-Step Solution:

1. **Identify the Halides**: The halides of carbon provided in the question are:
- CF4 (Carbon Tetrafluoride)
- CCl4 (Carbon Tetrachloride)
- CBr4 (Carbon Tetrabromide)
- CI4 (Carbon Tetraiodide)

2. **Analyze CF4 (Carbon Tetrafluoride)**:
- CF4 is known to be a gas at room temperature.
- **Boiling Point**: Approximately -128°C.
- **Conclusion**: CF4 is not a solid.

3. **Analyze CCl4 (Carbon Tetrachloride)**:
- CCl4 is a colorless liquid at room temperature.
- **Boiling Point**: 76°C.
- **Conclusion**: CCl4 is not a solid.

4. **Analyze CBr4 (Carbon Tetrabromide)**:
- CBr4 is a pale yellow solid at room temperature.
- **Boiling Point**: 190°C, but it decomposes on boiling.
- **Conclusion**: CBr4 is a solid.

5. **Analyze CI4 (Carbon Tetraiodide)**:
- CI4 is a bright red solid at room temperature.
- It also decomposes prior to boiling.
- **Conclusion**: CI4 is a solid.

### Final Conclusion:
The halides of carbon that are solids are:
- Carbon Tetrabromide (CBr4)
- Carbon Tetraiodide (CI4)

Thus, the correct options are **CBr4 and CI4**.