Among the following halogens, the one which does not form an oxyacid is :

Options

A. Fluorine
B. Chlorine
C. Bromine
D. Iodine

Explanation

To solve the question of which halogen does not form an oxyacid among fluorine, chlorine, bromine, and iodine, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Oxyacids**:
- Oxyacids are acids that contain oxygen, hydrogen, and another element (the central atom). In the case of halogens, these oxyacids are formed by combining halogens with oxygen and hydrogen.

2. **Identifying the Halogens**:
- The halogens in question are:
- Fluorine (F)
- Chlorine (Cl)
- Bromine (Br)
- Iodine (I)

3. **Analyzing Fluorine**:
- Fluorine is the most electronegative element and has a very small atomic size.
- Due to its high electronegativity, it tends to form strong bonds and does not easily form multiple oxyacids.

4. **Oxyacid Formation**:
- Fluorine can form one oxyacid, which is hypofluorous acid (HOF). However, it does not form other oxyacids like the other halogens do.

5. **Analyzing Other Halogens**:
- Chlorine, bromine, and iodine can form multiple oxyacids:
- Chlorine can form HClO (hypochlorous acid), HClO2 (chlorous acid), HClO3 (chloric acid), and HClO4 (perchloric acid).
- Bromine can form HBrO, HBrO2, HBrO3, and HBrO4.
- Iodine can form HIO, HIO2, HIO3, and HIO4.

6. **Conclusion**:
- Since fluorine forms only one oxyacid (HOF) and does not form multiple oxyacids like the other halogens, it is concluded that fluorine is the halogen that does not form an oxyacid in the same way as chlorine, bromine, and iodine do.

### Final Answer:
The halogen that does not form an oxyacid is **Fluorine (F)**.