Question Detail
Question
Which of the following alkenes reacts with HBr in the presence of a peroxide to give anti-Markovnikov's product?
Correct Answer
Option A is the correct answer.
Detailed Explanation
The peroxide effect (anti-Markovnikov addition of HBr) occurs only with HBr and only with unsymmetrical alkenes where the double bond is terminal (like 1-butene). 2,3-Dimethyl-2-butene, 2-butene, and 3-hexene are symmetrical or internal alkenes where anti-Markovnikov addition does not occur or gives the same product.
Hint
Which alkene is terminal and unsymmetrical?