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Which one of the following orders correctly represents the increasing acid strengths of the given acids?

1. HOClO < HOCl < HOClO2 < HOClO3
2. HOClO2 < HOClO3 < HOClO < HOCl
3. HOClO3 < HOClO2 < HOClO < HOCl
4. HOCl < HOClO < HOClO2 < HOClO3

Correct answer: HOCl < HOClO < HOClO2 < HOClO3

Solution

The acid strength increases with the number of oxygen atoms attached to the central atom. Therefore, the order of increasing acid strength is HOCl < HOClO < HOClO2 < HOClO3.

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