The correct order of acid strength is

Options

A. `HCIO_(4) lt HCIO_(3) lt HCIO_(2) lt HCIO`
B. `HCIO_(2) lt HCIO_(3) lt HCIO_(4) lt HCIO`
C. `HCIO_(4) lt HCIO lt HCIO_(2) lt HCIO_(3)`
D. `HCIO lt HCIO_(2) lt HCIO_(3) lt HCIO_(4)`

Answer

D

Explanation

These are all oxoacids. The acidic strength of oxoacids increases with an increase of oxidation state of central atom (CI) or with an increase of number of number of oxygen atom bonded to central atom:
`H-O-overset(+1)(Cl) lt H-O-overset(+3)(Cl=O`
`lt H-overset(+7)(O)-overset(O)overset(||)underset(O)underset(||)(CI)=O`