Which one of the following orders is not proper?
A. `F_2 gt Cl_2 gt Br_2 gt I_2` : Electronegativity
B. `F_2 gt Cl_2 gt Br_2 gt I_2` : Bond dissociation energy
C. `F_2 gt Cl_2 gt Br_2 gt I_2 ` : Oxidising power
D. `HI gt HBr gt HCl gt HF` : Acidic property in water