Question

The acidic nature of halogen acids in methanoic acid is:
$HF>HCl>HBr>HI$ . If true write 1, else write 0.

Answer 1

The acidic nature of halogen acids in methanoic acid is
$HF>HCl>HBr>HI$
It is based on the electronegativity difference between H and haloge.
$F_2$ is most electronegative and $I_2$ is the least electronegative.
Thus, the electronegativity difference is maximum in HF and minimum in HI.
HF is the most ionic and strongest acid in methanoic acid whereas HI is
least ionic and weakest acid in methanoic acid.