# Markovinikov's Addition Rule?

What is Markovnikov's Rule? My chemistry teacher was teaching organic chemistry, and in reaction he says that it uses MMarkovnikov's rule, and went on teaching, he didn't described it,as he was very strict i could not gather the courage to ask him.

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Markovnikov's Rule (note spelling) is used to predict how (for example) HX, where X is a halide, adds to an unsymmetrical olefin. As the diagram below shows, Markovnikov addition follows the rule that the "H" will add to the least substituted carbon while the "X" will add to the most substituted carbon. This is due to the fact that these reactions proceed by protonaton of the olefin to yield a carbocation. Protonation at the least substituted carbon yields the most stable carbocation (in this case a secondary carbocation). Finally the carbocation reacts with $\ce{X^-}$ to yield the final product.