Question

Which of the following is the strongest acid?

• A. $SO(OH{)}_2$
• B. $S{O}_2(OH{)}_2$
• C. $Cl{O}_3\left(OH\right)$
• D. $CO(OH{)}_3$

Answer 1

The correct option is C $Cl{O}_3\left(OH\right)$

$Cl{O}_3\left(OH\right)$ is $HCl{O}_4$ in which oxidation number of chlorine is +7 which is maximum. So it is more acidic.

Any other compound does not contain an atom whose oxidation state is greater than this. Hence $Cl{O}_3\left(OH\right)$ is strongest acid.

Hence, option C is correct.