Arrange the following acids in the decreasing order of the acidic strength. HC C COOH I ,C H COOH II , CH CH COOH III ,CH COOH IV Choose the correct option.

Acidity increases as the electronegativity of the carbon atom directly attached to –COOH group increases, or the hybridization of the carbon atom directly attached to COOH changes from 3 2 sp sp sp. -> -> The acidic strength decreases in the order I II III IV