# Among the following oxoacids, the correct decreasing order of acid strength is

$\begin{array}{1 1}(A)\;HClO_4 > HClO_3 > HClO_2 > HOCl\\(B)\;HClO_2 > HClO_4 > HClO_3 > HOCl\\(C)\;HOCl > HClO_2 > HClO_3 > HClO_4\\(D)\;HClO_4 > HOCl > HClO_2 > HClO_3\end{array}$

the correct decreasing order of acid strength is $HClO_4 > HClO_3 > HClO_2 > HOCl$
Hence (A) is the correct answer.