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Question

Among the following oxoacids, the correct decreasing order of acid strength is
  1. HOCl>HCIO2>HClO3>HClO4
     
  2. HClO2>HClO4>HClO3>HOCl
  3. HClO4>HOCl>HClO2>HClO3
     
  4. HClO4>HClO3>HClO2>HOCl
     


Solution

The correct option is D HClO4>HClO3>HClO2>HOCl
 
Acidic strength of oxocids depends upon the stability of conjugate base. More stable the conjugate base of an acid, stronger is the acid.
HClO4ClO4+H+HClO3ClO3+H+HClO2ClO2+H+HClOClO+H+
Conjugate bases stabilizes by resonance.

ClOdoes not show resonance. Thus, the stability order of conjugate base due to resonance is
ClO4>ClO3>ClO2>ClO
Hence, the acidic strength of given oxoacids is as follows
HClO4>HClO3>HClO2>HClO
 

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