The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is
−COOH, −SO3H, −CONH2, −CHO
−SO3H, −COOH, −CONH2, −CHO
−CHO, −COOH, −SO3H, −CONH2
−CONH2, −CHO, −SO3H, −COOH
B.
−SO3H, −COOH, −CONH2, −CHO