Select the correct order of acidity :

Options

A. `HI gt HBr gt HCl gt HF`
B. `HClO_(4) gt HBrO_(4) gt HIO_(4)`
C. `HClO gt HBrO gt HIO`
D. `HClO_(4) gt HBrO_(3) gt HIO_(2) gt HCIO`

Answer

To determine the correct order of acidity among the given compounds, we will analyze each option based on the principles of bond strength, electronegativity, and oxidation state.

### Step-by-Step Solution:

1. **Understanding Acidity**:
- Acidity is defined by the ability of a compound to donate a proton (H⁺). The weaker the bond between H and the atom it is bonded to, the more acidic the compound will be.

2. **Analyzing the First Option (HI, HBr, HCl, HF)**:
- As we move down the group in the halogens (from HF to HI), the size of the atom increases, leading to longer and weaker H-X bonds.
- Therefore, the order of acidity is:
- HI > HBr > HCl > HF
- **Conclusion**: This order is correct.

3. **Analyzing the Second Option (HClO₄, HBrO₄, HIO₄)**:
- Here, we consider the electronegativity of the central atom (Cl, Br, I). Chlorine is the most electronegative, followed by bromine and then iodine.
- The higher the electronegativity, the more it can weaken the H-X bond, leading to higher acidity.
- Therefore, the order of acidity is:
- HClO₄ > HBrO₄ > HIO₄
- **Conclusion**: This order is correct.

4. **Analyzing the Third Option (HClO, HBrO, HIO)**:
- Similar to the previous case, we look at the electronegativity of the central atom. Chlorine is the most electronegative, followed by bromine and then iodine.
- Thus, the order of acidity is:
- HClO > HBrO > HIO
- **Conclusion**: This order is correct.

5. **Analyzing the Fourth Option (HClO₄, HBrO₄, HIO₂, HClO)**:
- Here, we need to consider the oxidation states of the central atoms:
- HClO₄ (Cl +7), HBrO₄ (Br +7), HIO₂ (I +4), HClO (Cl +1).
- Acidity increases with the oxidation state of the central atom. Therefore, the order of acidity is:
- HClO₄ > HBrO₄ > HIO₂ > HClO
- **Conclusion**: This order is correct.

### Final Conclusion:
All four options provided in the question show the correct order of acidity based on the principles of bond strength, electronegativity, and oxidation state.

---