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

H O C l > H C I O_{2} > H C l O_{3} > H C l O_{4}

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H C l O_{4} > H O C l > H C l O_{2} > H C l O_{3}

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H C l O_{4} > H C l O_{3} > H C l O_{2} > H O C l

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H C l O_{2} > H C l O_{4} > H C l O_{3} > H O C l

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Solution

The correct option is C $H C l O_{4} > H C l O_{3} > H C l O_{2} > H O C l$

Acidic strength of oxocids depends upon the stability of conjugate base. More stable the conjugate base of an acid, stronger is the acid.
$H C l O_{4} ⇌ C l O_{4}^{-} + H^{+} H C l O_{3} ⇌ C l O_{3}^{-} + H^{+} H C l O_{2} ⇌ C l O_{2}^{-} + H^{+} H C l O ⇌ C l O^{-} + H^{+}$
Conjugate bases stabilizes by resonance.

$C l O^{-}$ does not show resonance. Thus, the stability order of conjugate base due to resonance is
$C l O_{4}^{-} > C l O_{3}^{-} > C l O_{2}^{-} > C l O^{-}$
Hence, the acidic strength of given oxoacids is as follows
$H C l O_{4} > H C l O_{3} > H C l O_{2} > H C l O$

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