Which of the following has a higher acidic character than benzoic acid?
Answer & explanation
Correct answer: option 3
Bromine is an electron withdrawing group that disperse the negative charge on the carboxylate ion and strengthens its acidic character. p-Bromobenzoic acid has a pKa value of 3.96 compared to 4.19, which is the pKa value of benzoic acid.