See image — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

Step 1 - Identify the parent structure: The compound contains a benzene ring as the core structure. Step 2 - Identify the substituents: At one position of the benzene ring, there is an acetyl group (-C(=O)-CH3, i.e., a ketone with a methyl group). At the para (1,4) position relative to the acetyl group, there is an ester group of the form -C(=O)-O-CH2CH3 (an ethyl ester). Step 3 - Determine the principal characteristic group for naming: In IUPAC nomenclature, the carboxylic acid (and its derivatives, including esters) takes priority over ketones. Therefore, the ester group defines the parent chain/name. The compound is named as a benzoate ester. Step 4 - Name the ester portion: The ethyl ester of benzoic acid is 'ethyl benzoate.' The parent is ethyl benzoate. Step 5 - Name the substituent: The acetyl group (-COCH3) attached to the benzene ring at the para position relative to the ester is named as an 'acetyl' substituent, giving the locant prefix '4-acetyl.' Step 6 - Combine: The full IUPAC-style name is ethyl 4-acetylbenzoate, where '4-acetyl' indicates the acetyl group is at carbon 4 of the benzoate ring (para to the ester). Therefore, the correct answer is ethyl 4-acetylbenzoate.