Answer to Question #304921 in Organic Chemistry for shamsa

Question

a) How does the rate of the reaction change as you go along the series HF – HCl

– HBr – HI?

b) Briefly explain the trend you have given in part (a).

c) How does the rate of reaction change as you go from ethene to propene to 2-

methylbut-2-ene?

Answer 1

Reaction rates increase in the order HF < HCl < HBr < HI. Hydrogen fluoride reacts much more slowly than the other three, and is normally ignored in talking about these reactions. When the hydrogen halides react with alkenes, the hydrogen-halogen bond has to be broken.