How would you prepare haloalkane through halogen exchange reactions?

1.	How would you prepare haloalkane through halogen exchange reactions?
Answer» Solution :HALOGEN exchange reactions: (a) Finkelsteing reaction: Chloro or BROMOALKANE on heating with a CONCENTRATED solution of sodium iodide in dry acetone gives iodo alkanes. This reaction is called Finkelstein reaction, (`S_(N)2` reaction). (b) Chloro or BROMO alkanes on heating with metallic FLUORIDES like AgF, `SbF_(3)` or `Hg_(2)F_(2)` gives fluoro alkanes. this reactions is called swarts reaction.

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