A) \[HOCl\]
B) \[HCl{{O}_{2}}\]
C) \[HCl{{O}_{3}}\]
D) \[HCl{{O}_{4}}\]
Correct Answer: D
Solution :
Perchloric acid \[(HCl{{O}_{4}})\] is the strongest acid among these because the acidic character of oxoacid increases with increasing the oxidation number of a particular halogen atom. \[\overset{+1}{\mathop{HOCl}}\,<\overset{+3}{\mathop{HCl{{O}_{2}}}}\,<\overset{+5}{\mathop{HCl{{O}_{3}}}}\,<\overset{+7}{\mathop{HCl{{O}_{4}}}}\,\]
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