In general,when the addition of an unsymmetrical electrophilic reagent to an unsymmetrical alkene forms the product predicted by Markovnikov's rule,that occurs because:

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When an unsymmetrical electrophilic reagent is added to an unsymmetrical alkene, the formation of the carbocation intermediate is the rate-determining step. The more stable carbocation intermediate is formed preferentially, and this intermediate subsequently forms the product. According to Markovnikov's rule, the electrophile adds to the sp2 carbon atom of the alkene that has more hydrogen atoms attached to it (i.e., the less substituted carbon atom) to form the more stable carbocation intermediate. Therefore, the product formed by Markovnikov's addition is favored because it is formed via the more stable carbocation intermediate.

In General,when the Addition of an Unsymmetrical Electrophilic Reagent to an Unsymmetrical