Account for the formation of both 3-bromo-2, 2-dimethyl butane and 2-bromo-2, 3-dimethyl butane from the reaction of HBr with 2, 3-dimethyl-1-butene.

Explanation

`CH_3-overset(CH_3)overset(|)underset(CH_3)underset(|)C-CH=CH_2+HBroverset("Markonikav addition")rarrH_3C-overset(CH_3)overset(|)underset(CH_3)underset(|)C-underset(Br)underset(|)CH-CH_3`
3-bromo-2, 2-dimethyl butane
The reaction steps are

The addition of HBr to some alkene gives a mixture of expected alkyl bromide and an isomer formed by rearrangement.