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Among the following, the correct order of acidity is

1. HClO3 < HClO4 < HClO2 < HClO
2. HClO < HClO2 < HClO3 < HClO4
3. HClO2 < HClO < HClO3 < HClO4
4. HClO4 < HClO2 < HClO < HClO3

Correct answer: HClO < HClO2 < HClO3 < HClO4

Solution

The acidity of oxoacids of chlorine increases with the number of oxygen atoms attached to the central chlorine atom due to increased electron-withdrawing effects, which stabilize the conjugate base. Thus, the correct order is HClO < HClO2 < HClO3 < HClO4.

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