Question 1
Question detail
Describe the stability of carbocations and explain why tertiary carbocations are more stable than secondary carbocations.
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exam_style
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Topic
Alkenes
Question
Describe the stability of carbocations and explain why tertiary carbocations are more stable than secondary carbocations.
Answer
Tertiary carbocations are more stable than secondary carbocations because they are bonded to three alkyl groups, which can donate electron density through inductive effects, reducing the positive charge on the carbon atom. This stabilizes the carbocation.
Explanation
This answer highlights the concept of carbocation stability based on the number of alkyl substituents. It tests the student's understanding of how molecular structure influences stability in organic chemistry.
Common mistake
Misunderstanding Carbocation Stability
Students often confuse the stability of carbocations, thinking that all carbocations are equally stable regardless of their structure.
To explain carbocation stability, remember that tertiary carbocations are more stable than secondary, which are more stable than primary. This is due to the inductive effect and hyperconjugation from surrounding alkyl groups. For example, a tertiary carbocation (R3C+) is stabilized by three alkyl groups donating electron density, while a primary carbocation (RCH2+) is only stabilized by one. Thus, when predicting the major product of an electrophilic addition reaction, consider the stability of the carbocation formed during the reaction.
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