Propene yields two products, however only one predominates as
per Markovnikov’s rule (Unit 13, Class XI)
(ii) Addition of halogens: In the laboratory, addition of bromine in
CCl4 to an alkene resulting in discharge of reddish brown colour
of bromine constitutes an important method for the detection of
double bond in a molecule The addition results in the synthesis
of vic-dibromides, which are colourless (Unit 9, Class XI) Alkyl iodides are often prepared by the reaction of alkyl chlorides/
bromides with NaI in dry acetone