what is the main product??

Addition of hydrogen halides: An alkene is converted to corresponding alkyl halide by reaction with hydrogen chloride, hydrogen bromide or hydrogen iodide

 

Propene yields two products; however,only one predominates according toMarkovnikov’s rule.

The rule states that,

“The addition of unsymmetrical reagents such as HX, H2O, HOX, etc. to unsymmetrical alkenes occurs in such a way that the negative part of the addendum (i.e., adding molecule) goes to that carbon atom of the double bond which carries lesser number of hydrogen atoms.”