Question

When alkenes are heated
with Br, or Cl, at high temperature,
hydrogen atom of allylic carbon is
substittued with halogen atom giving
allyl halide.​

Answer 1

Answer:

At high temperature, halogen molecule undergo homolytic cleavage to form radicals. These radicals then react with the alkene.

As allylic radical is stabilized by resonance, it is favored and so, allyl radical is the intermediate.

Then at chain termination, halogen radical and allyl radical combine to form allyl halide.

This does not takes place at low temperature as homolytic cleavage can occur at high temperature or in UV light.