Which of the following statements is correct

Options

A. Only chlorine and bromine form oxy acids
B. All halogens form oxy acids
C. All halogens except fluorine form oxy acids
D. Only iodine form oxy acids.

Answer

To determine which statement regarding halogens and oxyacids is correct, let's analyze each option step by step.

1. **Understanding Oxyacids**: Oxyacids are acids that contain oxygen, hydrogen, and another element (in this case, a halogen). The general formula for oxyacids can be represented as HnXOm, where X is a halogen.

2. **Analyzing the Halogens**:
- **Fluorine (F)**: Fluorine is the most electronegative element and does not have available d-orbitals. As a result, it does not form stable oxyacids.
- **Chlorine (Cl)**: Chlorine can form several oxyacids, such as hypochlorous acid (HClO), chlorous acid (HClO2), chloric acid (HClO3), and perchloric acid (HClO4).
- **Bromine (Br)**: Bromine can also form oxyacids, including hypobromous acid (HBrO), bromous acid (HBrO2), bromic acid (HBrO3), and perbromic acid (HBrO4).
- **Iodine (I)**: Iodine can form oxyacids as well, such as hypoiodous acid (HIO), iodous acid (HIO2), iodic acid (HIO3), and periodic acid (HIO4).

3. **Evaluating Each Statement**:
- **Option 1**: "Only chlorine and bromine form oxyacid." - This is incorrect because iodine also forms oxyacids.
- **Option 2**: "All halogens form oxyacid." - This is incorrect because fluorine does not form oxyacids.
- **Option 3**: "All halogens except fluorine form oxyacid." - This is correct because chlorine, bromine, and iodine can form oxyacids, while fluorine cannot.
- **Option 4**: "Only iodine forms oxyacid." - This is incorrect because chlorine and bromine also form oxyacids.

4. **Conclusion**: The correct statement is **Option 3: "All halogens except fluorine form oxyacid."**