Isobutyl bromide may be obtained from isobutylene and HBr in the presence of
Answer & explanation
Correct answer: option 3
The correct answer is option 3. peroxide.
Isobutyl bromide can be obtained from isobutylene and HBr in the presence of a peroxide, such as benzoyl peroxide. The peroxide acts as a free radical initiator, which causes the HBr to add to the isobutylene in an anti-Markovnikov fashion.
The other options are incorrect. Option (1) hydroquinone, is a reducing agent and will not react with isobutylene or HBr. Option (2) diphenylamine, is a free radical scavenger and will inhibit the reaction between isobutylene and HBr.