(B) The Swarts reaction is used to prepare alkyl fluorides from alkyl chlorides or alkyl bromides. This is achieved by heating the alkyl chloride or b

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(B) The Swarts reaction is used to prepare alkyl fluorides from alkyl chlorides or alkyl bromides. This is achieved by heating the alkyl chloride or bromide in the presence of a metallic fluoride,such as $AgF$,$Hg_2F_2$,$CoF_2$,or $SbF_3$. For example: $CH_3-Br + AgF \rightarrow CH_3F + AgBr$ Thus,the Swarts reaction yields fluorohydrocarbons.