Phenol is less acidic than ______________.
(i) ethanol
(ii) o-nitrophenol
(iii) o-methyl phenol
(iv) o-methoxy phenol
The answer is the option (ii). The acidity of phenol is determined by its electron-withdrawing or donating ability. The present in phenol is an electron-withdrawing group, so it increases the acidity whereas groups like being electron-donating groups, they decrease the acidity of phenol is less acidic compared to o-nitrophenol from the given options. Thus, the correct option is (ii) o-nitrophenol