Markovnikov Rule  

When an unsymmetrical reagent adds to an unsymmetrical alkene, the part of the reagent becomes attached to the double bonded carbon which bears the greatest number of hydrogen atoms.

Mechanism:-

The mechanism of this reaction involves the following steps.

Step1 :

HBr ionises to give a proton (electrophile) and a bromide ion (nucleophile)

Step2 :

The proton attacks the double bond to form a more stable carbonium ion.

Step3 :

The bromide ion attacks the more stable secondary carbonium ion to give the major product.

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