S

Shyam Dubey • 3.70K Points
Extraordinary

Q. Which reagent is typically used to perform a nucleophilic substitution (SN2) reaction on a primary alkyl halide?

  • (A) Tertiary amine (bulky base)
  • (B) Sodium iodide in acetone
  • (C) Peroxyacid
  • (D) Chromic acid (H2CrO4)
  • Correct Answer - Option(B)
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Explanation by: Shyam Dubey
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.

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