The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is
(a) – COOH ,- SO _3 H ,- CONH _2,- CHO
(b) – SO _3 H ,- COOH ,- CONH _2,- CHO
(c) – CHO ,- COOH ,- SO _3 H ,- CONH _2
(d) – CONH _2,- CHO ,- SO _3 H ,- COOH
(b) – SO _3 H ,- COOH ,- CONH _2,- CHO