Answer to Question #310477 in Organic Chemistry for MHX

Question

Acidic strength order of dinitrobenzoic acids having (2,6), (2,3), (2,4) and (3,4) positions

Answer 1

Correct option is A)....(2,6)

Since, electron donating groups decreases the acid strength, therefore, 4-methoxy benzoic acid is a weaker acid than benzoic acid. Further, since electron-withdrawing groups increase the acid strength, therefore, both 4-nitrobenzoic acid and 3, 4-dinitrobenzoic acid are stronger acid than benzoic acid.Further, due to presence of an additional NO2​ at m-position with respect to COOH group, 3, 4-dinitrobenzoic acid thus the overall acid strength increase in the order:4-methoxy benzoic acid < benzoic acid < 4-nitrobenzoic acid < 3, 4-dinitrobenzoic acid.