Question

# Among the following oxoacids, the correct decreasing order of acid strength isHOCl>HCIO2>HClO3>HClO4  HClO2>HClO4>HClO3>HOClHClO4>HOCl>HClO2>HClO3  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. HClO4⇌ClO−4+H+HClO3⇌ClO−3+H+HClO2⇌ClO−2+H+HClO⇌ClO−+H+ Conjugate bases stabilizes by resonance. ClO−does not show resonance. Thus, the stability order of conjugate base due to resonance is ClO−4>ClO−3>ClO−2>ClO− Hence, the acidic strength of given oxoacids is as follows HClO4>HClO3>HClO2>HClO

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