The acidic strength of oxyacids follow the order

Options

A. `HCIO_3 gt HCIO_2 gt HOCl`
B. `HCIO_3 lt HCIO_2 lt HOCI`
C. `HCIO_3 gt HCIO_2 lt HOCI`
D. `HCIO_3 lt HCIO_2 gt HOCI`

Answer

To determine the acidic strength of oxyacids, we need to analyze the oxidation states of the central atom in each oxyacid. The acidic strength of oxyacids increases with the increase in the oxidation state of the central atom. Here, we will consider the oxyacids of chlorine: HClO4, HClO3, HClO2, and HOCl.

### Step-by-Step Solution:

1. **Identify the Oxyacids**: The oxyacids we will consider are:
- HClO4 (Perchloric acid)
- HClO3 (Chloric acid)
- HClO2 (Chlorous acid)
- HOCl (Hypochlorous acid)

2. **Determine the Oxidation States**:
- For HClO4:
- The oxidation state of Cl can be calculated as follows:
- Let the oxidation state of Cl be x.
- The equation becomes: \( x + 4(-2) + 1 = 0 \)
- Solving gives: \( x - 8 + 1 = 0 \) → \( x = +7 \)
- For HClO3:
- The equation becomes: \( x + 3(-2) + 1 = 0 \)
- Solving gives: \( x - 6 + 1 = 0 \) → \( x = +5 \)
- For HClO2:
- The equation becomes: \( x + 2(-2) + 1 = 0 \)
- Solving gives: \( x - 4 + 1 = 0 \) → \( x = +3 \)
- For HOCl:
- The equation becomes: \( x + (-2) + 1 = 0 \)
- Solving gives: \( x - 1 = 0 \) → \( x = +1 \)

3. **Compare the Oxidation States**:
- HClO4: +7
- HClO3: +5
- HClO2: +3
- HOCl: +1

4. **Establish the Order of Acidic Strength**:
- The acidic strength increases with the increase in oxidation state:
- HClO4 > HClO3 > HClO2 > HOCl
- Therefore, the order of acidic strength is:
- HClO4 > HClO3 > HClO2 > HOCl

5. **Conclusion**:
- The correct order of acidic strength of the given oxyacids is HClO4 > HClO3 > HClO2 > HOCl.