The correct order of acid strength is

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HClO4 < HClO3 < HClO2 < HClO

HClO < HClO2 < HClO3 < HClO4

HClO4 < HClO < HClO2 < HClO3

HClO2 < HClO3 < HClO4 < HClO

answer is B.

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Detailed Solution

Acidic nature and thermal stability of oxy acids increases with increasing oxidation state of chlorine : HClO < HClO2 < HClO3 < HClO4.

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