Which of the following substituent names are correctly assigned to their unsaturated structures? — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

Options A, B, and C are correct standard IUPAC substituent names (common names: vinyl, allyl, and ethynyl respectively). Option D is incorrect; the free valency carbon is C1, so $-CH_2-C \equiv CH$ is Prop-2-ynyl.