Mark the correct order of decreasing acid strength of the following compounds.
The answer is the option (ii). According to the (+R) effect in the cyclic compound, the presence of an electron-withdrawing group at para position to makes the acidity level maximum of the compound whereas having an electron-donating group at the para position to makes the acidity level minimum. So, according to this concept, the correct decreasing order of acidity of the given compounds is Option (ii) b > d > a > c > e