For which one of the following properties of halogens the sequence `F gt Cl gt Br gt I` holds good

Options

A. Electron affinity
B. Electronegativity
C. Atomic radius
D. Boiling point

Answer

To determine the property of halogens for which the sequence `F > Cl > Br > I` holds true, we can analyze the properties of halogens one by one.

### Step 1: Understand the Halogens
The halogens are a group of elements in Group 17 of the periodic table, which include fluorine (F), chlorine (Cl), bromine (Br), and iodine (I).

### Step 2: Analyze Electronegativity
Electronegativity is the tendency of an atom to attract electrons in a chemical bond. In the periodic table, electronegativity generally increases from left to right across a period and decreases from top to bottom within a group.

- **Fluorine (F)** is at the top of the group and has the highest electronegativity.
- **Chlorine (Cl)** is below fluorine and has a lower electronegativity than fluorine but higher than bromine and iodine.
- **Bromine (Br)** is below chlorine and has a lower electronegativity than chlorine.
- **Iodine (I)** is at the bottom of the group and has the lowest electronegativity.

Thus, the order of electronegativity is:
**F > Cl > Br > I**

### Step 3: Compare Other Properties
- **Boiling Point:** The boiling point of halogens increases down the group (I > Br > Cl > F).
- **Atomic Size:** The atomic size increases down the group (I > Br > Cl > F).
- **Electron Affinity:** The trend is not as straightforward, but generally, it decreases down the group.

### Conclusion
The sequence `F > Cl > Br > I` specifically holds true for **electronegativity** among the halogens.

### Final Answer
The property for which the sequence `F > Cl > Br > I` holds good is **electronegativity**.

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