Q. Which reagent is typically used to perform a nucleophilic substitution (SN2) reaction on a primary alkyl halide?
✅ Correct Answer: (B)
Sodium iodide in acetone
Explanation: Sodium iodide in acetone (Finkelstein reaction) is a common method to substitute halides, and iodide is a good nucleophile for SN2 on primary alkyl halides. A bulky base favors E2 elimination (option1) especially on secondary/tertiary centers. Peroxyacid is used for epoxidation of alkenes (not SN2). Chromic acid is an oxidizing agent used to oxidize alcohols, not to perform SN2 substitutions.
Explanation by: Sikhar Chaudhary
Sodium iodide in acetone (Finkelstein reaction) is a common method to substitute halides, and iodide is a good nucleophile for SN2 on primary alkyl halides. A bulky base favors E2 elimination (option1) especially on secondary/tertiary centers. Peroxyacid is used for epoxidation of alkenes (not SN2). Chromic acid is an oxidizing agent used to oxidize alcohols, not to perform SN2 substitutions.