Question

write the Methods of preparation of alkyl halidesusing phosphorous halide ​

Answer 1

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An alkyl halide may be prepared by action of phosphorous halide on alcohol. Phosphorous tribromide and triiodide are usually generated in situ (produced in the reaction mixture) by the action of red phosphorous on bromine and iodine respectively. Phosphorous pentachloride reacts with alcohol to give alkyl chloride.

3R - OH + PX3 3R - X + H3PO3

R - OH + PCl5 R - Cl + HCl + POCl3

Answer 2

There are primarily 4 different types of preparation techniques of Haloalkanes and Haloarenes. They include Preparation of Haloalkanes and Haloarenes from:

Alcohols

Hydrocarbons

Alkenes by addition of hydrogen halides and halogens

Halogen exchange reaction.