The **Finkelstein reaction** is:
AConversion of alkenes to alkyl halides via peroxide effect
BConversion of alkyl chlorides/bromides to alkyl iodides using NaI in acetone (NaCl/NaBr precipitates out, driving equilibrium)
CHydrolysis of alkyl halides
DHalogenation of arenes
Answer & Solution
Correct answer: B. Conversion of alkyl chlorides/bromides to alkyl iodides using NaI in acetone (NaCl/NaBr precipitates out, driving equilibrium)
Finkelstein: R-Cl (or R-Br) + NaI ⟶ R-I + NaCl↓. Acetone dissolves NaI but precipitates NaCl, shifting equilibrium toward product. Classic S$_N$2 reaction.
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