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Question

The correct order of acidic strength of HOCl, HClO2, HClO3 and HClO4 are:


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Solution

(A) HOCl > HClO2 > HClO3 > HClO4

(B) HOCl4 > HClO3 > HClO2 > HClO

(C) HOCl3 > HClO4 > HClO2 > HClO

(D) HOCl3 > HClO2 > HClO > HClO4

The Correct Answer is (B) HOCl4 > HClO3 > HClO2 > HClO

Solution:

Oxygen is more electronegative than chlorine. With an increase in the number of O atoms attached to Cl, more electrons are pulled away from the O−H bond and weaker becomes the O−H bond. This increases the acid strength.

The decreasing order of acidic strength is HOCl4 > HClO3 > HClO2 > HClO

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