Question

Which of the following does exist?

• A. $HF{O}_2$
• B. $HCl{O}_2$
• C. $HBr{O}_2$
• D. $HI{O}_2$

Answer 1

Answer: (B)

$HCl{O}_2$ is a chlorous acid which is oxyacid of halogen.

Remaining oxyacids of halogens do not exist.

Bromous acid $HBr{O}_2$ and Iodous acid $HI{O}_2$ and fluorous acid are not likely to exist in nature as they would decompose into oxides and water vapour when trying to isolate them from their respective acid solutions.

Hence, option $B$ is correct.