Which among the following order of given properties is correct

Options

A. `HOClgtHClO_(2)gtHClO_(3)gtHClO_(4)` - oxidising nature
B. `ClgtFgtBrgtI` - electron affinity
C. `Cl_(2)gtBr_(2)gtI_(2)gtF_(2)` - bond dissociation energy
D. `HFltHClltHBrltHI` - acidic nature

Answer

To determine the correct order of the given properties, we will analyze each option step by step.

### Step 1: Analyze the Oxidizing Nature of Acids (HClO, HClO2, HClO3, HClO4)

1. **Identify the central atom**: In these acids, the central atom is chlorine (Cl).
2. **Calculate the oxidation state of chlorine in each acid**:
- For HClO:
\[ +1 + x - 2 = 0 \implies x = +1 \]
- For HClO2:
\[ +1 + x - 4 = 0 \implies x = +3 \]
- For HClO3:
\[ +1 + x - 6 = 0 \implies x = +5 \]
- For HClO4:
\[ +1 + x - 8 = 0 \implies x = +7 \]
3. **Determine the oxidizing power**: The higher the oxidation state, the stronger the oxidizing agent. Thus, the order of oxidizing power is:
\[ \text{HClO4} > \text{HClO3} > \text{HClO2} > \text{HClO} \]

### Step 2: Analyze Electron Affinity

1. **Understand electron affinity**: It is the energy released when an electron is added to a neutral atom.
2. **Order of electron affinity**: As we move down the group in the periodic table, electron affinity generally decreases due to increasing atomic size and shielding effect.
- Correct order:
\[ \text{F} > \text{Cl} > \text{Br} > \text{I} \]

### Step 3: Analyze Bond Dissociation Energy

1. **Understand bond dissociation energy**: It is the energy required to break a bond in a molecule.
2. **Order of bond dissociation energy**: Generally, as we move down the group, bond dissociation energy decreases due to increasing atomic size. However, fluorine is an exception due to its small size causing significant electron-electron repulsion.
- Correct order:
\[ \text{F} < \text{Cl} < \text{Br} < \text{I} \]

### Step 4: Analyze Acidic Strength of Hydrogen Halides (HF, HCl, HBr, HI)

1. **Understand acidic strength**: The strength of an acid increases as the bond between hydrogen and the halogen weakens.
2. **Order of acidic strength**: As we move down the group, the bond strength decreases, making it easier to release H+ ions.
- Correct order:
\[ \text{HF} < \text{HCl} < \text{HBr} < \text{HI} \]

### Conclusion

From the analysis, the correct orders for each property are:
- **Oxidizing nature**: HClO4 > HClO3 > HClO2 > HClO
- **Electron affinity**: F > Cl > Br > I
- **Bond dissociation energy**: F < Cl < Br < I
- **Acidic strength**: HF < HCl < HBr < HI

Thus, the only correct option is the one related to the acidic strength of hydrogen halides.

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