Which of the following noble gases does not form clatherates?

Options

A. Kr
B. Ne
C. Xe
D. Ar

Explanation

To determine which noble gas does not form clathrates, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Clathrates**:
- Clathrates are compounds where a guest molecule (in this case, a noble gas) is trapped within a cage-like structure formed by another molecule, typically water.

2. **Identify the Noble Gases Given**:
- The options provided are Krypton, Neon, Xenon, and Argon.

3. **Analyze Each Noble Gas**:
- **Krypton**: This noble gas can be trapped in the cage-like structure of water, thus it can form clathrates.
- **Xenon**: Similar to Krypton, Xenon can also be trapped in the clathrate structure, allowing it to form clathrates.
- **Argon**: Argon is another noble gas that can fit into the cavities of the clathrate structure and can form clathrates.
- **Neon**: Neon is much smaller in size compared to the other noble gases. Due to its small size, it cannot be effectively trapped in the cavities of the clathrate structure.

4. **Conclude the Answer**:
- Based on the analysis, Neon is the noble gas that does not form clathrates.

### Final Answer:
- The noble gas that does not form clathrates is **Neon** (Option 2).