a
Alkyl chloride or bromide undergo substitution and get converted to an alkyl iodide on treatment with a solution of sodium iodide in acetone. e.g. \(CH_3CH_2CH_2Br + NaI\) \(\xrightarrow{{acetone}}\) \(CH_3CH_2CH_2I\) + \(NaBr\) This reaction is also known as Finkelstein Reaction