1.

The set with correct order of acidity is

Answer»

`HClO lt HClO_(2) lt HClO_(3) lt HClO_(4)`
`HClO_(4) lt HClO_(3) lt HClO_(2) lt HClO`
`HClO lt HClO_(4) lt HClO_(3) lt HClO_(2)`
`HClO_(4) lt HClO_(2) lt HClO_(3) lt HClO`

Solution :For oxyacids containing similar central atom, the acid strength increases with the increase in the number of oxygen ATTACHED to the central atom and not attached to any other atom.
Alternatively, higher the oxidation number of the central atom, higher is the acidity of the SPECIES. THUS acidity follows the order
`{:("Oxi. No. of Cl",HClO ,lt,HClO_(2),lt, HClO_(2), lt, HClO_(4)),(,+1,,+3,,+5,,+7):}`


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