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Markownicov's rule states that when an unsymmetrical reagent (like HBr) adds to an unsymmetrical alkene, then the halogen (negative part) gets attached to the carbon atom which carries least number of hydrogen atoms. Anti Markownicov's rule states that the addition of unsymmetrical reagent (HBr) takes place exactly opposite to Markownicov's rule in presence of peroxide. Hence it is also called as peroxide effect.
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