Question detail
Describe how the presence of a pi bond in alkenes affects their reaction with electrophiles.
Try the question, check the answer, then read the explanation to understand the curriculum point.
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Topic
Alkenes
Question
Describe how the presence of a pi bond in alkenes affects their reaction with electrophiles.
Answer
The pi bond in alkenes is more reactive than the sigma bond due to its higher energy and weaker bond strength. When an electrophile approaches an alkene, it can attack the pi bond, leading to the formation of a carbocation intermediate. This reaction pathway is crucial for electrophilic addition reactions, allowing alkenes to react with various electrophiles.
Explanation
This answer effectively explains the role of the pi bond in the reactivity of alkenes with electrophiles. It tests the student's understanding of electrophilic addition mechanisms, which is essential for grasping organic reaction pathways.
Common mistake
Misunderstanding Bonding in Alkenes
Students often confuse sigma and pi bonds in alkenes, thinking that both types of bonds are formed in the same way.
To clarify, remember that a sigma bond is formed by the head-on overlap of orbitals, while a pi bond is formed by the side-to-side overlap of p orbitals. For example, in an alkene like ethene (C2H4), the C=C bond consists of one sigma bond and one pi bond. The sigma bond is formed first, followed by the formation of the pi bond. This distinction is crucial for understanding reactivity.
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