The correct order of acidic strength is

Options

A. `HClO_(4) gt HCl O_(3) gt HClO_(2) gt HCl O`
B. `HClO_(3) + HCl O_(2) gt HClO_(3)`
C. `H_(3) PO_(2) gt H_(3) PO_(3) gt H_(3) PO_4`
D. All of these

Answer

To determine the correct order of acidic strength among the given compounds, we need to analyze the oxidation states of the central atoms in each compound. The acidic strength of oxoacids generally increases with an increase in the oxidation state of the central atom. Here’s how we can systematically approach the problem:

### Step-by-Step Solution:

1. **Identify the Compounds**: Let's assume we are given the following oxoacids of chlorine: HClO4, HClO3, HClO2, and HClO.

2. **Calculate the Oxidation State of Chlorine in Each Compound**:
- **For HClO4**:
- Let the oxidation state of Cl be \( x \).
- The equation becomes: \( +1 + x + 4(-2) = 0 \)
- Simplifying gives: \( +1 + x - 8 = 0 \) → \( x = +7 \)

- **For HClO3**:
- The equation becomes: \( +1 + x + 3(-2) = 0 \)
- Simplifying gives: \( +1 + x - 6 = 0 \) → \( x = +5 \)

- **For HClO2**:
- The equation becomes: \( +1 + x + 2(-2) = 0 \)
- Simplifying gives: \( +1 + x - 4 = 0 \) → \( x = +3 \)

- **For HClO**:
- The equation becomes: \( +1 + x + (-2) = 0 \)
- Simplifying gives: \( +1 + x - 2 = 0 \) → \( x = +1 \)

3. **Determine the Order of Oxidation States**:
- The oxidation states we calculated are:
- HClO4: +7
- HClO3: +5
- HClO2: +3
- HClO: +1

4. **Establish the Order of Acidic Strength**:
- Since acidic strength increases with increasing oxidation state, the order of acidic strength based on oxidation states is:
- HClO4 > HClO3 > HClO2 > HClO

5. **Conclusion**:
- Therefore, the correct order of acidic strength is:
- **HClO4 > HClO3 > HClO2 > HClO**