Which one of the following orders is not in according with the property stated against it ?

Options

A. `F_(2)gtCl_(2)gtBr_(2)gtI_(2)`, oxidising power
B. HI gt HBr gt HCl gt HF, acidic property in water
C. ` F_(2) gt Cl_(2) gt Br_(2) gt I_(2)` , Electronegativity
D. ` F_(2) gt Cl_(2) gt Br_(2) gt I_(2)` , Bond dissociation energy

Answer

To solve the question regarding the order that is not in accordance with the properties stated against it, we need to analyze the properties of halogens: oxidizing power, acidic property in water, electronegativity, and bond dissociation energy.

### Step-by-Step Solution:

1. **Identify the Halogens**: The halogens we are considering are Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I).

2. **Oxidizing Power**:
- The oxidizing power of halogens decreases down the group.
- Order: F2 > Cl2 > Br2 > I2
- Explanation: Fluorine is the strongest oxidizing agent because it has a high tendency to gain electrons.

3. **Acidic Property in Water**:
- The acidic strength of hydrogen halides increases down the group.
- Order: HF < HCl < HBr < HI
- Explanation: As we move down the group, the bond strength decreases, making it easier for the hydrogen to dissociate.

4. **Electronegativity**:
- The electronegativity of halogens decreases down the group.
- Order: F > Cl > Br > I
- Explanation: Fluorine is the most electronegative element due to its small size and high nuclear charge.

5. **Bond Dissociation Energy**:
- The bond dissociation energy of halogen molecules decreases down the group.
- Order: Cl2 > Br2 > F2 > I2
- Explanation: The bond strength decreases as the size of the halogen increases, leading to weaker bonds.

6. **Identify the Incorrect Order**:
- We need to find which order does not align with the properties stated.
- The order for bond dissociation energy is incorrectly stated in the video as Cl2 > Br2 > F2 > I2. The correct order should be F2 > Cl2 > Br2 > I2, as F2 has the highest bond dissociation energy due to its small size and strong bond.

### Conclusion:
The order that is not in accordance with the properties stated against it is the bond dissociation energy of halogens.