Question

Give the halogen exchange method to prepare alkyl halides.

Answer 1

Explanation:

Alkyl halide from halogen exchange:

In this reaction, alkyl halides are prepared from alkyl halides only.

For example:

R−Cl+NaI

Δ

Acetone

R−I+NaCl

R−Br+NaI

Δ

Acetone

R−I+NaBr

This reaction is known as the Finkelstein reaction.

The synthesis of alkyl fluoride is best accomplished by heating alkyl iodide in the presence of a metallic fluoride such as AgF. This reaction is called "Swarts reaction".

R−I+AgF→R−F+AgI