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 given compounds is colorless and odorless, we will analyze each option one by one.

### Step 1: Analyze CH3NC (Methyl Isocyanide)
- **Properties**: Methyl isocyanide is known to be colorless.
- **Odor**: However, it has a strong, unpleasant odor.
- **Conclusion**: This compound is not odorless.

### Step 2: Analyze CHI3 (Iodoform)
- **Properties**: Iodoform is also colorless.
- **Odor**: It has a distinctive smell, often described as sweet or medicinal.
- **Conclusion**: This compound is not odorless.

### Step 3: Analyze CHCl3 (Chloroform)
- **Properties**: Chloroform is a colorless liquid.
- **Odor**: It has a sweet smell, which is noticeable.
- **Conclusion**: This compound is not odorless.

### Step 4: Analyze CF2Cl2 (Chlorofluorocarbon)
- **Properties**: Chlorofluorocarbon is colorless.
- **Odor**: It is also known to be odorless.
- **Conclusion**: This compound is both colorless and odorless.

### Final Answer
Based on the analysis, the compound that is colorless and odorless is **CF2Cl2 (Chlorofluorocarbon)**. Therefore, the correct answer is **Option D**.

---