Under what conditions can 2-methylpropene be converted into iso butyl bromide on reacting with HBr?

Explanation

In presence of peroxides, anti-Markovnikov's addition of HBr to 2-methylpropene gives isobutyl bromide.
`underset("2-Methylpropene")(CH_(3)-overset(CH_(3))overset(|)(C)=CH_(2))+HB r underset(("Anti-Mark addition"))overset(RCOOR)to underset("Isobutyl bromide")(CH_(3)-overset(CH_(3))overset(|)(C)H-CH_(2)Br)`