Which of the following compounds must use a special suffix in their accepted systematic IUPAC name? — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

Compound A has three identical terminal groups on an unbranched chain, invoking the special suffix rule. Compounds B and C have terminal groups directly on alicyclic rings. Compound D is simply butanedioic acid, which uses the standard "-dioic acid" suffix.