The correct decreasing order of priority for the functional groups in IUPAC nomenclature is: — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

According to IUPAC nomenclature priority rules, carboxylic acids ($-COOH$) have the highest priority, followed by sulphonic acids ($-SO_3H$), then acid derivatives like amides ($-CONH_2$), and finally aldehydes ($-CHO$).