• # question_answer Increasing order of acid strength of halogen acid is  [DCE 2000] A) $HF<HCl<HBr<HI$ B) $HCl<HBr<HI<HF$ C) $HF<HI<HBr<HCl$ D) None of these

As going down the group size increases, an liberation of ${{H}^{+}}$ ion becomes easy. So the order of acidity is : $HI>HBr>HCl>HF$