Addition of HBr to isobutylene mainly gives
Correct answer: D. tert-butyl bromide
- A. isobutyl bromide
- B. n-butyl bromide
- C. sec-butyl bromide
- D. tert-butyl bromide
Explanation
The addition of HBr to isobutylene predominantly yields tert-butyl bromide because the reaction proceeds through a carbocation intermediate. When HBr adds to isobutylene, the double bond opens up, and the bromine atom attaches to the more substituted carbon, leading to the formation of a tertiary carbocation. This intermediate is more stable than secondary or primary carbocations, favoring the formation of tert-butyl bromide. In contrast, isobutyl bromide, n-butyl bromide, and sec-butyl bromide would require pathways that do not occur under these conditions, making them incorrect options.
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About Chemistry of Hydrocarbons
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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