Which of the following compounds is colourless and odourless?

Options

A. `CH_(3)`NC
B. `CHI_(3)`
C. `CHCl_(3)`
D. `CF_(2)Cl_(2)`

Answer

To determine which of the following compounds is colorless and odorless, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Compounds**: We have four compounds to evaluate:
- CH3NC (Methyl isocyanide)
- Iodofoam
- Chloroform
- CF2Cl2 (Chlorofluorocarbon)

2. **Evaluate CH3NC (Methyl Isocyanide)**:
- **Color**: It is colorless.
- **Odor**: It has a strong odor.
- **Conclusion**: This compound is not odorless.

3. **Evaluate Iodofoam**:
- **Color**: It is colorless.
- **Odor**: It has a distinctive smell, commonly recognized in hospitals.
- **Conclusion**: This compound is not odorless.

4. **Evaluate Chloroform**:
- **Color**: It is colorless.
- **Odor**: It has a sweet smell.
- **Conclusion**: This compound is not odorless.

5. **Evaluate CF2Cl2 (Chlorofluorocarbon)**:
- **Color**: It is colorless.
- **Odor**: It is odorless.
- **Conclusion**: This compound is both colorless and odorless.

6. **Final Answer**: Based on the evaluations, the compound that is colorless and odorless is **CF2Cl2 (Chlorofluorocarbon)**.