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  • Among the following oxoacids, the correct decreasing order of acid strength is :Option: 1 <img alt="\mathrm{H O Cl>H C l O_{2}>H C l O_{3}>H

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

Option: 1

\mathrm{H O Cl>H C l O_{2}>H C l O_{3}>H C l O_{4}}


Option: 2

\mathrm{HClO _{4}> HOCl > HClO _{2}> HClO _{3}}


Option: 3

\mathrm{HClO _{4}> HClO _{3}> HClO _{2}> HOCl}


Option: 4

\mathrm{HClO _{2}>H C lO _{4}>H C l O _{3}>H O C l}


Answers (1)

best_answer

When we consider the structure of conjugate bases of each oxyacid of chlorine, we find that \mathrm{ClO^{-}_{4}}  is most stable due to greater delocalization of negative charge. The extent of this delocalisation decreases as the number of doubly bonded Oxygen atoms decreases on the Chlorine centre.

Thus, the order of acidic strength is 

\mathrm{HClO_{4}> HClO_{3}> HClO_{2}> HOCl}

Hence, the correct answer is Option (3)

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