Answer:
Option D
Explanation:
Alkyl fluorides can be prepared by action of mercurous fluoride or antimony trifluorides ( inorganic fluorides) on corresponding alkyl halide. This reaction is known as Swarts reaction.
$CH_{3}Br+AgF\rightarrow CH_{3}F+AgBr$
methyl fluoride
But, when action of NaI/acetone takes place on alkyl chloride or bromide, alkyl iodide forms. This reaction is called the ' Finkelstein reaction '.
$C_{2}H_{5}Cl\xrightarrow[\text{acetone}]{\text{Nacl}}C_{2}H_{5}I+NaCl$
Free radical fluorination is highly explosive reaction so not preferred for the preparation of fluoride.
