JEE Main | 2014Chemical BondingMedium
Question
Among the following oxoacids, the correct decreasing order of acid strength is
Options
A.HOCl > HClO2 > HClO3 > HClO4
B.HClO4 > HOCl > HClO2 > HClO3
C.HClO4 > HClO3 > HClO2 > HOCl
D.HClO2 > HClO4 > HClO3 > HOCl
Solution
HClO4 ⇋ ClO4- + H+
HClO3 ⇋ ClO3- + H+
HClO2 ⇋ ClO2- + H+
HOCl ⇋ ClO- + H+
Resonance produced conjugate base.
(i)
(ii)
(iii)
(iv) ClO- is not resonance stabilized.
As per resonance stability order of conjugate base is
ClO4- > ClO3- > ClO2- > ClO-
Hence acidic strength order is
HClO4 > HClO3 > HClO2 > HClO
HClO3 ⇋ ClO3- + H+
HClO2 ⇋ ClO2- + H+
HOCl ⇋ ClO- + H+
Resonance produced conjugate base.
(i)
(ii)
(iii)
(iv) ClO- is not resonance stabilized.
As per resonance stability order of conjugate base is
ClO4- > ClO3- > ClO2- > ClO-
Hence acidic strength order is
HClO4 > HClO3 > HClO2 > HClO
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