m-Nitrobenzoic acid can be obtained by

Options

A. toluene `underset(KMnO_(4))overset([O])toAunderset(H_(2)SO_(4))overset(HNO_(3))to`
B. toluene `underset(CrO_(2)Cl_(2))overset([O])toAunderset(H_(2)SO_(4))overset(HNO_(3))toBunderset(KMnO_(4))overset([O])to`
C. toluene `underset(HNO_(3)+H_(2)SO_(4))overset("Nitration")toAunderset(KMnO_(4))overset([O])to`
D. all these method

Answer

A, B

Explanation

Etard reaction.