Swarts reaction : It is one of the best rxn. to produce fluoroalkane. When alkyl chloride / alkyl bromide is heated in presence of metallic fluoride ( such as AgF, Hg2F2, CoF2 etc ), alkyl fluoride is produced. In this rxn, we should apply the metal fluoride having a heavy metal, as AgF, Hg2F2 etc. But if metal flouride as NaF or KF is used, yield of the rxn will decrease.