Chemistry - Halogen Derivative Question with Solution | TestHub

This is Finkelstein reaction which involves the conversion of an alkyl chloride/bromide to an alkyl iodide by the addition of sodium iodide in acetone. Because sodium iodide is soluble in acetone and $\mathrm{NaCl}$ and $\mathrm{NaBr}$ are not, the equilibrium is shifted by the precipitation of insoluble salt. $R-X\underset{MX}{\stackrel{M{X}^{\prime }}{\rightleftharpoons }}R-X^{\prime }$ The equilibrium position of the reaction depends on the nucleophilicity of the anion, whether a good leaving group is present and whether one anion is better stabilised than the other in a given solvent.