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

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

Correct Option is (b) $HCl{O}_2$
$HCl{O}_2$ is a chlorous acid which is oxyacid of halogen.
Remaining halous acids do not exist.
Bromous acid $\left(HBr{O}_2\right)$ and Iodous acid $\left(HI{O}_2\right)$ 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.