Question

Which among the following acid is strongest?

• A. $HCl{O}_2$
• B. $HBr{O}_2$
• C. $HI{O}_2$
• D. All have same acidic strength

Answer 1

The correct option is A $HCl{O}_2$

As the size of the halogen atom increases the acidic nature of oxyacids of halogens decreases.So the order of size of halogen atoms in the given acids is $Cl<Br<I$.

So the strongest acid is $HCl{O}_2$ as chlorine in chlorous acid has less size in the given acids.

Hence option A is correct.