Correct order of boiling point of halogens is

Options

A. `F_2 lt Cl_2 lt Br_2 lt I_2`
B. `Cl gt F_2 gt Br_2 gt I_2`
C. `F_2 gt Cl_2 gt Br_2 gt I_2`
D. `Cl_2 lt F_2 lt Br_2 lt I_2`

Answer

To determine the correct order of boiling points of halogens, we need to consider the properties of the halogens and how they change as we move down the group in the periodic table.

### Step-by-Step Solution:

1. **Identify the Halogens**: The halogens are the elements in Group 17 of the periodic table. These include Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I).

2. **List the Halogens in Order**: The halogens in order of increasing atomic number are:
- Fluorine (F)
- Chlorine (Cl)
- Bromine (Br)
- Iodine (I)

3. **Understand the Trend in Boiling Points**: As we move down the group from Fluorine to Iodine, the atomic size increases. This increase in size leads to a corresponding increase in the strength of van der Waals forces (intermolecular forces) due to the larger electron cloud.

4. **Analyze the Boiling Points**:
- Fluorine (F) has the lowest boiling point due to its small size and weak van der Waals forces.
- Chlorine (Cl) has a higher boiling point than Fluorine.
- Bromine (Br) has a higher boiling point than Chlorine.
- Iodine (I) has the highest boiling point among the halogens due to the largest atomic size and strongest van der Waals forces.

5. **Correct Order of Boiling Points**: Based on the analysis, the correct order of boiling points from lowest to highest is:
- Fluorine (F) < Chlorine (Cl) < Bromine (Br) < Iodine (I)

6. **Conclusion**: Therefore, the correct order of boiling points of halogens is:
- Cl < Br < I

### Final Answer:
The correct order of boiling points of halogens is: **Cl < Br < I**