Which of the following oxoacids of halogen doesn't exist

Options

A. `HOBrO`
B. `HOF`
C. `HOBrO_2`
D. `HOIO_3`

Answer

To determine which oxoacid of halogen does not exist among the given options, we will analyze each option based on the known chemistry of halogen oxoacids.

### Step 1: Analyze the options
We have four options to consider:
1. H-O-B-R-O (Hypobromous acid)
2. H-O-F (Hypofluorous acid)
3. H-O-B-R-O-2 (Bromic acid)
4. H-O-I-O-3 (Periodic acid)

### Step 2: Evaluate the existence of each oxoacid

**Option 1: H-O-B-R-O (Hypobromous acid)**
- Hypobromous acid (HOBr) does exist, but the structure H-O-B-R-O suggests a different form that is not stable. In general, HOBrO (which would imply a bromine in a higher oxidation state) is not a recognized stable oxoacid.

**Option 2: H-O-F (Hypofluorous acid)**
- Hypofluorous acid (HOF) does exist. It is the only oxoacid formed by fluorine due to its high electronegativity and inability to form higher oxidation states.

**Option 3: H-O-B-R-O-2 (Bromic acid)**
- Bromic acid (HBrO2) does exist. It is a well-known oxoacid of bromine.

**Option 4: H-O-I-O-3 (Periodic acid)**
- Periodic acid (HIO3) also exists and is a recognized oxoacid of iodine.

### Step 3: Conclusion
Based on the analysis, the oxoacid that does not exist is **Option 1: H-O-B-R-O**.

### Final Answer
The oxoacid of halogen that does not exist is **H-O-B-R-O**.

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