See image — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

Concept: IUPAC nomenclature of acid halides (acyl halides). An acid halide is named by replacing the '-ic acid' ending of the parent carboxylic acid with '-yl halide' as the common/retained name, but the systematic IUPAC name uses the term 'carbonyl halide' as a suffix to the parent hydrocarbon name. Step 1: Identify the compound. C6H5COCl is phenyl carbonyl chloride, i.e., it consists of a benzene ring (C6H5-) attached to a -COCl (carbonyl chloride) group. Step 2: Determine the systematic IUPAC name. The parent structure is benzene. The functional group -COCl is named as 'carbonyl chloride' in IUPAC nomenclature (as a principal characteristic group suffix). Combining: benzene + carbonyl chloride = Benzene carbonyl chloride. Step 3: Evaluate each option. (a) Benzoyl Chloride - this is the common/trivial name, not the systematic IUPAC name. (b) Benzene chloro ketone - incorrect; COCl is an acid chloride, not a ketone, and 'chloro ketone' is not a valid designation here. (c) Benzene carbonyl chloride - this is the correct systematic IUPAC name, using 'carbonyl chloride' as the suffix for the -COCl group attached to benzene. (d) Chloro phenyl ketone - incorrect; this misidentifies the functional group as a ketone. Therefore, the correct answer is C.