Which of the following statements are correct?

Options

A. Among halogens, radius ratio between iodine and fluorine is maximum.
B. Leaving F-F bond, all halogens have weaker X-X bond than X-X' bond in inter-halogens.
C. Among inter- halogen compounds maximum number of atoms ate present in iodine fluoride.
D. Inter-halogen compounds are more reactive than halogen compounds.

Explanation

To determine which statements about halogens and interhalogen compounds are correct, we will analyze each statement step by step.

### Step 1: Analyze the first statement
**Statement 1:** Among halogens, the radius ratio between iodine and fluorine is maximum.

- **Explanation:**
- Iodine (I) has the largest atomic radius among the halogens, while fluorine (F) has the smallest atomic radius.
- Therefore, the ratio of their radii (I/F) is indeed the maximum compared to the ratios of other halogens.

**Conclusion:** This statement is **true**.

### Step 2: Analyze the second statement
**Statement 2:** All halogens have weaker X-X bonds rather than X-X' bonds (e.g., Cl-Cl is weaker than ICl).

- **Explanation:**
- The Cl-Cl bond is a single bond formed between two chlorine atoms, which are both in the 3p orbital.
- ICl, on the other hand, involves a bond between iodine (which has larger orbitals) and chlorine. The bond formed between different sized orbitals (3p and 5p) is generally weaker than bonds formed between atoms of the same size.
- However, the Cl-Cl bond is actually stronger than the ICl bond due to the effective overlap of the 3p orbitals.

**Conclusion:** This statement is **false**.

### Step 3: Analyze the third statement
**Statement 3:** Among interhalogen compounds, the maximum number of atoms are present in iodine fluoride.

- **Explanation:**
- Iodine fluoride (IF) is an interhalogen compound, and it can exist in various forms, including IF3 and IF5, which have a higher number of atoms than other interhalogen compounds.
- Therefore, this statement is correct as it refers to the maximum number of atoms in the context of interhalogen compounds.

**Conclusion:** This statement is **true**.

### Step 4: Analyze the fourth statement
**Statement 4:** Interhalogen compounds are more reactive than halogen compounds.

- **Explanation:**
- Interhalogen compounds consist of two different halogens, which generally leads to weaker bonds compared to homonuclear halogen bonds (like Cl-Cl).
- The weaker bonds in interhalogens make them more reactive since they can break more easily.

**Conclusion:** This statement is **true**.

### Final Conclusion:
The correct statements are:
- Statement 1: True
- Statement 2: False
- Statement 3: True
- Statement 4: True

Thus, the correct options are **1, 3, and 4**.

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