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

Let's analyze the properties of halogens (Group 17):

1. Oxidising Power: Fluorine is the strongest oxidising agent, and oxidising power decreases down the group ($F_2 > Cl_2 > Br_2 > I_2$) as standard electrode potentials decrease (+2.87 V to +0.54 V). This order is correct .
2. Acidic Property: The acidic strength of hydrohalic acids depends on the bond dissociation enthalpy. As the bond dissociation enthalpy decreases down the group ($H-F > H-Cl > H-Br > H-I$), the bond breaks more easily, releasing $H^+$ ions. Thus, acidic strength increases: $HF < HCl < HBr < HI$. This order is correct .
3. Electronegativity: Electronegativity decreases down the group as atomic size increases. The order is $F > Cl > Br > I$. This order is correct .
4. Bond Dissociation Energy: The bond dissociation enthalpy of $F_2$ is anomalously low (155 kJ/mol) compared to $Cl_2$ (243 kJ/mol) and even $Br_2$ (192 kJ/mol). This is due to the relatively large electron-electron repulsion among the lone pairs in the small $F_2$ molecule. The correct order is $Cl_2 > Br_2 > F_2 > I_2$. Therefore, the order $F_2 > Cl_2 > Br_2 > I_2$ is incorrect .