# How does hydrohalogenation mechanisms work?

1. For an alkene, which I presume is your substrate, the alkene would have the capability to donate electrons from its $\pi$ bond to polarize the $\text{H"-"X}$ bond, where $\text{X}$ is a halogen.
2. That changes the molecule's electron distribution so that we have $\stackrel{{\delta}^{+}}{\text{H")-stackrel(delta^(-))("X}}$, which then leads to the acquisition of a proton from the hydrohalogenic acid onto the less-substituted carbon (the one with more hydrogens).
4. Then, ${\text{X}}^{-}$ can attack as a nucleophile and bind to the more-substituted carbon, as per Marknovnikov addition.