Which of the following have melting point less than 298 K

Options

A. Fluorine
B. Bromine
C. Iodine
D. Chlorine

Explanation

To determine which of the given halogens have melting points less than 298 K, we will analyze the melting points of each halogen mentioned in the question: Chlorine, Bromine, and Iodine.

### Step 1: Identify the melting points of the halogens
- **Chlorine (Cl2)**: The melting point of chlorine is approximately 171 K (-102 °C).
- **Bromine (Br2)**: The melting point of bromine is approximately 265 K (-8 °C).
- **Iodine (I2)**: The melting point of iodine is approximately 387 K (114 °C).

### Step 2: Compare the melting points with 298 K
Now, we will compare each melting point with 298 K:
- **Chlorine**: 171 K < 298 K (melting point is less than 298 K)
- **Bromine**: 265 K < 298 K (melting point is less than 298 K)
- **Iodine**: 387 K > 298 K (melting point is greater than 298 K)

### Step 3: Conclusion
From the analysis, we find that:
- Chlorine and Bromine have melting points less than 298 K.
- Iodine has a melting point greater than 298 K.

Thus, the halogens that have melting points less than 298 K are **Chlorine and Bromine**.

### Final Answer:
- **Chlorine (Cl2)**
- **Bromine (Br2)**