Question detail
Predict the major product when but-2-ene (C4H8) undergoes electrophilic addition with bromine (Br2).
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Alkenes
Question
Predict the major product when but-2-ene (C4H8) undergoes electrophilic addition with bromine (Br2).
Answer
The major product is 2,3-dibromobutane (C4H8Br2).
Explanation
This question assesses the ability to predict products from electrophilic addition reactions. In this case, bromine adds across the double bond of but-2-ene, resulting in 2,3-dibromobutane, as both bromine atoms attach to the carbon atoms involved in the double bond.
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).
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.