Which of the following is correct statement?

Options

A. `F_(2)` has higher dissociation energy than `Cl_(2)`
B. F has higher electron affinity than Cl
C. HF is stronger acid than HCl
D. Boiling point increases down the group in halogens

Explanation

To solve the question regarding which of the statements is correct, we will analyze each option step by step.

### Step 1: Analyze Option 1
**Statement:** F2 has a higher dissociation energy than Cl2.

- **Analysis:**
- F2 has a smaller bond length compared to Cl2, which might suggest it has a higher bond dissociation energy. However, the repulsions between the lone pairs of electrons on the fluorine atoms in F2 are significant. This repulsion weakens the bond, resulting in a lower bond dissociation energy for F2 compared to Cl2.
- **Conclusion:** This statement is **incorrect**.

### Step 2: Analyze Option 2
**Statement:** F has a higher electron affinity than Cl.

- **Analysis:**
- While fluorine is more electronegative than chlorine, electron affinity refers to the energy change when an electron is added to a neutral atom. The electron affinity of chlorine is greater than that of fluorine because the smaller size of fluorine leads to increased electron-electron repulsion when an additional electron is added, resulting in less energy being released.
- **Conclusion:** This statement is **incorrect**.

### Step 3: Analyze Option 3
**Statement:** HF is a stronger acid than HCl.

- **Analysis:**
- HF has a smaller bond length and a higher bond dissociation energy compared to HCl. Higher bond dissociation energy means that HF is less likely to release H+ ions in solution, making it a weaker acid than HCl. Therefore, HCl is a stronger acid than HF.
- **Conclusion:** This statement is **incorrect**.

### Step 4: Analyze Option 4
**Statement:** Boiling point increases down the group in halogens.

- **Analysis:**
- As we move down the group in the periodic table, the atomic weight of halogens increases. With an increase in atomic weight, the van der Waals forces (intermolecular forces) also increase, leading to higher boiling points. This trend is consistent across the halogen group.
- **Conclusion:** This statement is **correct**.

### Final Answer:
The correct statement is **Option 4: Boiling point increases down the group in halogens**.

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