# What is a hydrohalogenation reaction?

Jul 13, 2018

Typically this is the addition of $H X$ $\left(X = C l , B r , I\right)$ to an olefin, $R - C H = C {H}_{2}$...

#### Explanation:

And the reaction follows the general scheme...

$R - C H - C {H}_{2} + H X \rightarrow {\underbrace{R \stackrel{+}{C} H C {H}_{3}}}_{\text{secondary carbocation}} + {X}^{-}$

$R \stackrel{+}{C} H C {H}_{3} + {X}^{-} \rightarrow R C H \left(X\right) C {H}_{3}$

This reaction follows so-called $\text{Markownikow selectivity}$,,the more substituted alkyl halide is favoured. Anyway, you are going to have to read your text...