The following acids have been arranged in order of decreasing acid strength. Identify the correct order.
ClOH (I) , BrOH (II) , IOH(III)

Options

A. `Igt IIgt III`
B. `II gt I gt III`
C. `IIIgtIIgtI`
D. `I gt III gt II`

Answer

To determine the correct order of acid strength for the given oxyacids ClOH (I), BrOH (II), and IOH (III), we need to analyze the factors that influence the acidity of these compounds.

### Step-by-Step Solution:

1. **Identify the Compounds**: We have three oxyacids:
- ClOH (Hypochlorous acid)
- BrOH (Hypobromous acid)
- IOH (Hypoiodous acid)

2. **Understand Acid Strength**: The strength of an acid is generally determined by its ability to donate a proton (H⁺) in solution. This ability is influenced by the bond strength between the hydrogen and the oxygen and the electronegativity of the central atom (Cl, Br, I).

3. **Electronegativity Trend**: The electronegativity of the halogens decreases as we move down the group in the periodic table:
- Chlorine (Cl) > Bromine (Br) > Iodine (I)

4. **Bond Strength**: The bond strength of the O-H bond is affected by the electronegativity of the central atom. A more electronegative atom will hold onto the bonding electrons more tightly, making it easier to release the H⁺ ion:
- Cl-O bond is stronger than Br-O bond, which is stronger than I-O bond.

5. **Acid Strength Order**: As the electronegativity decreases, the ability to donate H⁺ increases. Therefore, the order of acid strength from strongest to weakest is:
- ClOH > BrOH > IOH

6. **Conclusion**: Based on the analysis, the correct order of decreasing acid strength is:
- ClOH (I) > BrOH (II) > IOH (III)

### Final Answer:
The correct order of decreasing acid strength is: **ClOH > BrOH > IOH**, which corresponds to option 1.

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