Acidic strength order `HCIO gtHBrO gtHIO` .

Explanation

To determine the order of acidic strength of hypohalous acids \( HClO \), \( HBrO \), and \( HI \), we need to analyze the stability of their corresponding anions \( OCl^- \), \( OBr^- \), and \( OI^- \). The stability of these anions will help us understand the acidic strength of the acids.

### Step-by-Step Solution:

1. **Identify the Hypohalous Acids**:
- The acids in question are \( HClO \) (hypochlorous acid), \( HBrO \) (hypobromous acid), and \( HI \) (hypoiodous acid).

2. **Dissociation of Acids**:
- Each acid dissociates in water to release \( H^+ \) ions and their respective anions:
- \( HClO \rightarrow H^+ + OCl^- \)
- \( HBrO \rightarrow H^+ + OBr^- \)
- \( HI \rightarrow H^+ + OI^- \)

3. **Analyze Stability of Anions**:
- The stability of the anions \( OCl^- \), \( OBr^- \), and \( OI^- \) is crucial for determining the acidic strength.
- The stability of anions is influenced by the electronegativity of the atom bonded to oxygen. Higher electronegativity leads to better charge distribution and greater stability of the anion.

4. **Electronegativity Order**:
- The electronegativity of the halogens decreases as follows: \( Cl > Br > I \).
- This means \( OCl^- \) will be more stable than \( OBr^- \), and \( OBr^- \) will be more stable than \( OI^- \).

5. **Conclusion on Acidic Strength**:
- Since \( OCl^- \) is the most stable anion, \( HClO \) is the strongest acid.
- Next, \( OBr^- \) is less stable than \( OCl^- \), making \( HBrO \) the second strongest acid.
- Finally, \( OI^- \) is the least stable, making \( HI \) the weakest acid.
- Therefore, the order of acidic strength is \( HClO > HBrO > HI \).

### Final Order:
The order of acidic strength is:
\[ HClO > HBrO > HI \]