Identify best method for preparation of Alkyl fluoride from...

Swarts reaction is the best method for the preparation of alkyl fluorides. In this reaction, alkyl chlorides or bromides are heated in the presence of metallic fluorides such as $AgF$, $Hg_2F_2$, $CoF_2$, or $SbF_3$ to form alkyl fluorides.

$R-X + AgF \rightarrow R-F + AgX$ (where $X = Cl, Br$)

Finkelstein reaction is used for the preparation of alkyl iodides.

Sandmeyer's reaction is used for the preparation of aryl halides.

Wurtz reaction is used for the preparation of higher alkanes.

Answer: Swartz reaction