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Which of the following is a strongest acid among oxy acids of chlorine and why? "HClO, HClO2, HClO3, HClO4"


According to Bronsted Lowery concept, a strong acid has weak conjugate base and vice versa. 

The given oxy acids of chlorine HCIO, HCIO2, HClO3 and HClO4 and their conjugate bases are CIO-, CIO2-, ClO3-, ClO4- respectively. These anions are stabilised to greater extent, due to the presence of π-bond and lone pair, if number of π-bond increase extent of stabilisation increase. In case of ClO- there is no π-bond hence if form less stable conjugate base hence act as weak acid while in case of ClO4- it has three pπ-dπ bond which stablised greater extent and form more stable conjugate base hence it conjugate acid (HClO4) is strongest acid. Oxy acids of chlorine and their number of pπ-dπ bonds given as:

HOCI (0~Pπ-dπ)

HOCIO (1~Pπ-dπ)

HOClO2 (2~Pπ-dπ)

HOCIO3 (3~Pπ-dπ)

Thus overall order of acidic strength of oxy acids of chlorine is as:



                  "HClO < HClO2 < HClO3 < HClO4



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