CBSE Class 12-science Answered
please explain the cause of anti-markovnikov's rule? is it related with steric hinderance? why does it happen in presonce of peroxide
Asked by PRATIK SETHI | 30 Nov, 2010, 12:00: AM
Expert Answer
Dear Student
If organic peroxides are present it is a free radical chain reaction rather than electrophillic addition reaction.
Step 1 : Chain initiation
The chain is initiated by free radicals produced by an oxygen-oxygen bond in the organic peroxide breaking.
These free radicals extract a hydrogen atom from a hydrogen bromide molecule to produce bromine radicals.
Step 2 : Chain propagation
A bromine radical joins to the ethene using one of the electrons in the pi bond. That creates a new radical with the single electron on the other carbon atom.
That radical reacts with another HBr molecule to produce bromoethane and another bromine radical to continue the process.
etc
Step 3: Chain termination
Eventually two free radicals hit each other and produce a molecule of some sort. The process stops here because no new free radicals are formed
Regards
Topper team
Answered by | 01 Dec, 2010, 04:28: PM
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