Question
Tue March 01, 2011 By: Gaurav Avhad
 

why HBr only allows markwinkoffs rule is there any concept behind it or it is just a rule?

Expert Reply
Tue March 01, 2011
Dear Student,
The rule states that with the addition of  HX to an alkene, hydrogen  becomes attached to the less sunstituted  carbon , and the halide group becomes attached to the carbon with more alkyl substituents.
Every rule has a logical concept behind it.
The chemical basis for Markovnikov's Rule is the formation of the most stable carbocation during the addition process.
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