The most powerful oxidant among the following is

The most powerful oxidant among the following is
  1. $\mathrm{HOCl}$
  2. $\mathrm{HClO}_{2}$
  3. $\mathrm{HClO}_{3}$
  4. $\mathrm{HClO}_{4}$

Solution

Acidic strength : $\mathrm{HOCl} < \mathrm{HClO}_{2} < \mathrm{HCIO}_{3} < \mathrm{HClO}_{4}$
Oxidising power: $\mathrm{HOCl}>\mathrm{HClO}_{2}>\mathrm{HCIO}_{3}>\mathrm{HClO}_{4}$
As the stability of oxoanion increases, its tendency to decompose to give $O_{2}$ decreases and hence its oxidising power decreases.
Stability of oxoanion:
$\mathrm{CiO}^{\mathrm{\Theta}} < \mathrm{ClO}_{2}^{\Theta} < \mathrm{ClO}_{3}^{\Theta} < \mathrm{ClO}_{4}^{\Theta}$
Oxidising power: $\mathrm{HOCl}>\mathrm{HClO}_{2}>\mathrm{HCIO}_{3}>\mathrm{HClO}_{4} .$ /

Asked in: JEE-TOPICTESTS-CHEMISTRY

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