Predict the major product of the reaction of $\text{3,3-dimethyl-1-butene}$ with $\text{HBr}$ in the presence of peroxides.

Solution

1. Peroxides initiate a radical chain mechanism with $\text{HBr}$.
2. The bromine radical adds to the terminal carbon to form the more stable secondary radical.
3. The secondary radical abstracts a hydrogen atom from $\text{HBr}$.
4. The final product is the anti-Markovnikov addition product $\text{1-bromo-3,3-dimethylbutane}$.
5. Hence the answer is (A).