Question

What is a hydrohalogenation reaction?

Answer 1

Typically this is the addition of `HX` `(X=Cl, Br, I)` to an olefin, `R-CH=CH_2`...

Explanation:

And the reaction follows the general scheme...

`R-CH-CH_2 + HX rarr underbrace(Rstackrel(+)CHCH_3)_"secondary carbocation" + X^-`

`Rstackrel(+)CHCH_3 + X^(-)rarrRCH(X)CH_3`

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