The Finkelstein reaction involves the exchange of one halogen for another, especially, in primary alkyl halides.  It is used to synthesize one alkyl halide from another.
In the classical version of Finkelstein reaction, a primary alkyl halide, RX is treated with an alkali metal halide, like NaX’ or KX’,  in excess in acetone. The halogen, X in alkyl halide is replaced by X’ through an SN2 mechanism.
R-X  +  NaX’ <=========> RX’ + 2NaX
Where R = alkyl group; X & X’ are different halogens (usually X = Cl or Br, X’ = F or I).
* The halide exchange is a reversible reaction. The reaction is driven to completion by taking the advantage of differential solubility of metal halide salts in acetone solvent.
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