Which of the following statements are correct for benzoic acid ?
A. Nitration gives o- and - p- nitrobenzoic acid
B. Bromination gives m- bromo benzoic acid
C. The Friedel- Crafts reaction with `CH_(3)-underset(O)underset("||")C-Cl//AlCl_(3)` gives m- carboxy acetophenone.
D. The reaction with oleum gives 3- sulphobenzoic acid