Question

Which of the following parent oxy acid does not have its hypo acid?

• A. $H_{2}S{O}_2$
• B. $HN{O}_2$
• C. $H_{3}P{O}_3$
• D. $HCl{O}_3$

Answer 1

The correct option is A $H_{2}S{O}_2$

Hypo acid means the main element have lower oxidation state than the present acid.

Here, $HClO,{HClO}_2$ are Hypo acid ${HClO}_3$

$H_3{PO}_2$ is hypo acid of $H_3{PO}_3$

$HNO$ is hypo acid of ${HNO}_2$

But $H_2{SO}_2$ doesn't have hypo acid

Ans :- Option A.