Question detail
When propene (C3H6) reacts with hydrogen bromide (HBr), what is the major product formed?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Alkenes
Question
- A. 1-bromopropane
- B. 2-bromopropane
- C. bromopropane
- D. propyl bromide
Answer
2-bromopropane
Explanation
The reaction of propene with hydrogen bromide follows Markovnikov's rule, where the more stable carbocation forms. The major product is 2-bromopropane due to the formation of a more stable secondary carbocation.
Common mistake
Predicting Products from Unsymmetrical Alkenes
Students often incorrectly predict the major product of an electrophilic addition reaction involving unsymmetrical alkenes, failing to consider the stability of the carbocation intermediate.
To correctly predict the major product, identify the more stable carbocation that forms during the reaction. Use Markovnikov's rule, which states that the more substituted carbocation will be formed preferentially. For example, in the addition of HBr to propene (C3H6), the more stable secondary carbocation forms, leading to the major product being 2-bromopropane (C3H7Br).
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