The following acids have been arranged in the order of decreasing acid strength. Identify the correct order.
$$ClOH\left( {\text{I}} \right),BrOH\left( {{\text{II}}} \right),IOH\left( {{\text{III}}} \right)$$

Solution :
Among oxyacids of the same type formed by different elements, acidic nature increases with increasing electronegativity. In general, the strength of oxyacids decreases as we go down the family in the periodic table.
$$HOCl\left( {\text{I}} \right) > HOBr\left( {{\text{II}}} \right) > HOI\left( {{\text{III}}} \right)$$
[ In halogen groups $$Cl$$ is above $$Br$$ and $$I$$ ]