Question

Which one of the following oxy acid of fluorine exists ?

• A. $HOF$
• B. $HF{O}_3$
• C. $HF{O}_4$
• D. $HF{O}_2$

Answer 1

Answer: (A)

$HOF$

In fluorine d-orbitals are absent so it shows only +1 oxidation state in oxo-acid,
but not + 3, + 5 or + 7.

That's why unlike other members (halogens) fluorine only forms one oxoacid HOF.

Hence, option A is correct.