Which one of the following orders is not correct in accordance with the property stated against is ?

Options

A. `F_(2) gt Cl_(2) gt Br_(2) gt l_(2)` : Oxidising power
B. `Hl gt HBr gt HCl gt HF ` , Acidic property in water
C. `F_(2) gt Cl_(2) gt Br_(2) gt l_(2)` , Electronegativity
D. `F_(2) gt Cl_(2) gt Br_(2) gt l_(2)` : Bond dissociation energy

Answer

To solve the question regarding the incorrect order of properties among halogens, we will analyze each option step by step based on the properties mentioned.

### Step-by-Step Solution:

1. **Identify the Properties and Elements**:
We are given four options related to halogens (F, Cl, Br, I) and their properties: oxidizing power, acidic properties, electronegativity, and bond dissociation energy.

2. **Option 1: Oxidizing Power**:
- **Trend**: The oxidizing power of halogens decreases down the group.
- **Correct Order**: F2 > Cl2 > Br2 > I2
- **Conclusion**: This order is correct.

3. **Option 2: Acidic Properties in Water**:
- **Trend**: The acidic strength of hydrogen halides increases down the group.
- **Correct Order**: HI > HBr > HCl > HF
- **Conclusion**: This order is correct.

4. **Option 3: Electronegativity**:
- **Trend**: Electronegativity decreases down the group.
- **Correct Order**: F > Cl > Br > I
- **Conclusion**: This order is correct.

5. **Option 4: Bond Dissociation Energy**:
- **Trend**: Bond dissociation energy does not follow the same trend as electronegativity. Due to repulsion between non-bonding electrons in smaller atoms, F2 has lower bond dissociation energy than Cl2 and Br2.
- **Correct Order**: Cl2 > Br2 > F2 > I2
- **Conclusion**: This order is incorrect as it states Cl2 > Br2 > F2 > I2, which is true, but the order of F2 being lower than Cl2 and Br2 is not correctly represented in the original statement.

### Final Answer:
The incorrect order is found in **Option 4** regarding bond dissociation energy.

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