# Can you illustrate Markownikow's rule in the context of hydrohalogenation of olefins?

May 16, 2017

Is there a question here?

#### Explanation:

$\text{Markownikow addition}$ describes the general preference of unsymmetrical olefins towards addition of hydrogen halides.

i.e. $R C H = C {H}_{2} + H X \rightarrow R C {H}_{2} C {H}_{2} X$

$\text{To him that hath hydrogen shall be given hydrogen.....}$

This reflects the stability of the secondary carbocation as compared to the primary carbocation:

$X H + R C H = C {H}_{2} \rightarrow R \stackrel{+}{C} H - C {H}_{3} + {X}^{-}$

VERSUS

$X H + R C H = C {H}_{2} \rightarrow R C {H}_{2} - \stackrel{+}{C} {H}_{2} + {X}^{-}$