The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is:
–\( \mathrm{COOH} \) > –\( \mathrm{CONH_2} \) > –\( \mathrm{COCl} \) > –\( \mathrm{CHO} \)
–\( \mathrm{SO_3H} \) > –\( \mathrm{COCl} \) > –\( \mathrm{CONH_2} \) > –\( \mathrm{CN} \)
–\( \mathrm{COOH} \) > –\( \mathrm{COOR} \) > –\( \mathrm{CONH_2} \) > –\( \mathrm{COCl} \)