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Question: Answered & Verified by Expert
Among the following oxoacids, the correct decreasing order of acid strength is :
Chemistryp Block Elements (Group 15, 16, 17 & 18)JEE MainJEE Main 2014 (06 Apr)
Options:
  • A HOCl > HClO2 > HClO3 > HClO4
  • B HClO4 > HOCl > HClO2 > HClO3
  • C HClO4 > HClO3 > HClO2 > HOCl
  • D HClO2 > HClO4 > HClO3 > HOCl
Solution:
1082 Upvotes Verified Answer
The correct answer is: HClO4 > HClO3 > HClO2 > HOCl
In oxyacids of chlorine as oxygen content increases. The acidic strength increases.

HClO4 > HClO3 > HClO2 > HOCl

Conjugate base 

Cl O 4 4 R.S.

Cl O 3 3 R.S.

Cl O 2 2 R.S.

Cl O no R.S.

(conjugate base) anion stability increase due to resonance. So acidic character increase.
 

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