Select the correct order of acidic strength.

Options

A. `HI gt HBr gt HCl gt HF`
B. `HClO_(4) gt HBrO_(4) gt HIO_(4)`
C. `HClO lt HBrO lt HIO`
D. None of these

Answer

To determine the correct order of acidic strength for the given options, we will analyze each option step by step.

### Step 1: Analyze Option 1 (HI > HBr > HCl > HF)
1. **Understanding Acid Strength**: Acid strength is related to the ability of the acid to donate a proton (H⁺). The weaker the bond between H and the halogen, the stronger the acid.
2. **Bond Strength and Size**: As we move down the group in the periodic table from fluorine (F) to iodine (I), the size of the halogen increases, leading to longer and weaker H-X bonds.
3. **Order of Acidity**:
- HF has a strong H-F bond due to the small size of fluorine, making it a weak acid.
- HCl has a weaker bond than HF, making it a stronger acid than HF.
- HBr is stronger than HCl, and HI is the strongest due to the weakest bond.
4. **Conclusion**: The correct order is HI > HBr > HCl > HF.

### Step 2: Analyze Option 2 (HClO4 > HBrO4 > HIO4)
1. **Understanding Oxyacids**: The strength of oxyacids depends on the electronegativity of the central atom (the halogen in this case) and the number of oxygen atoms.
2. **Electronegativity**: Chlorine (Cl) is more electronegative than bromine (Br), which is more electronegative than iodine (I).
3. **Order of Acidity**:
- HClO4 has the highest acidity due to chlorine's high electronegativity.
- HBrO4 is next, followed by HIO4.
4. **Conclusion**: The correct order is HClO4 > HBrO4 > HIO4.

### Step 3: Analyze Option 3 (HClO < HBrO < HIO)
1. **Understanding Oxyacids Again**: Similar to the previous option, we consider the electronegativity of the halogens.
2. **Electronegativity Comparison**:
- Chlorine > Bromine > Iodine in terms of electronegativity.
3. **Order of Acidity**: The order should actually be HClO > HBrO > HIO, which contradicts the given order.
4. **Conclusion**: This order is incorrect.

### Step 4: Analyze Option 4 (None of these)
1. **Conclusion from Previous Steps**: Since we have found correct orders in options 1 and 2, option 4 stating "none of these" is incorrect.

### Final Conclusion
The correct orders of acidic strength are:
- Option 1: HI > HBr > HCl > HF (Correct)
- Option 2: HClO4 > HBrO4 > HIO4 (Correct)
- Option 3: HClO < HBrO < HIO (Incorrect)
- Option 4: None of these (Incorrect)

Thus, the correct answer is **Option 1 and Option 2**.