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JEE Main2014Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

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

Options

  1. AHOCl > HClO 2 > HClO 3 > HClO 4
  2. BHClO 4 > HOCl > HClO 2 > HClO 3
  3. CHClO 4 > HClO 3 > HClO 2 > HOCl
  4. DHClO 2 > HClO 4 > HClO 3 > HOCl

Correct answer

C. HClO 4 > HClO 3 > HClO 2 > HOCl

Step-by-step solution

In oxyacids of chlorine as oxygen content increases. The acidic strength increases. HClO 4 > HClO 3 > HClO 2 > HOCl Conjugate base C l O 4 − − 4 R . S . C l O 3 − − 3 R . S . C l O 2 − − 2 R . S . C l O − − n o R . S . (conjugate base) anion stability increase due to resonance. So acidic character increase.

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