Among the following oxoacids, the correct decreasing order of acid strength is
(IIT-JEE Advanced, 2014)

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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H O C l > H C l 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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Solution

The correct option is A $H C l O_{4} > H C l O_{3} > H C l O_{2} > H O C l$
i. Decreasing acid strength is due to the decrease in oxidation state of central atom, e.g.
+7 +5 +3 +1
$H C l O_{4} > H C l O_{3} > H C l O_{2} > H O C l$
ii. Decreasing acid strength is also due to the decrease in number of resonating structures of their conjugate base, e.g.
$H C l O_{4} + H_{2} O \to H_{3} O^{\oplus} + C l O_{4}^{⊖}$

Other three conjugate base, e.g.,
$C l O_{3}^{⊖}, C l O_{2}^{⊖} a n d C l O^{⊖}$ show 3, 2 and 1 resonating structures.

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