MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Friedel-Crafts acylation is an electrophilic aromatic substitution reaction where an acyl group is introduced into an aromatic ring. The reagents typically used for this reaction are acyl halides (such as acid chlorides, R-CO-Cl) or acid anhydrides, in the presence of a Lewis acid catalyst like anhydrous AlCl_3. Among the given options, R-CO-Cl (acid chloride) is the correct species used in the Friedel-Crafts acylation reaction.