Among the following, the corect order of acidity is

Options

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

Answer

3

Explanation

Acid strength of oxiacids of oxoacids of the same halogon increase with increase in the number of oxygen atome bonded to halgon or with increase in oxidation number of the halgon:

Greater the number of oxygen atoms in the anion (conjuagate base formed after removal of `H` as proton) greater will be the disperals of the negative charge through `ppi-dpi` back bonding and hence greater will be the stability of the anion:
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The more stable the anion the strongest the acid is. Note that as the stability of the anion increase its oxidizing power decreases ,thus the order of oxidising power of the oxoacids of `Cl` is the reverse order of acid strength:
`HCIO_(4) lt HCIO_(3) lt HCIO_(2) lt HCIO`