Textbook Question
Propose a mechanism for each reaction, showing explicitly how the observed mixtures of products are formed.
(e) 3-chlorobut-1-ene + AgNO3, H2O → but-2-en-1-ol + but-3-en-2-ol
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7. Substitution Reactions
SN1 Reaction
Multiple Choice
Which of the following statements about an reaction mechanism is true?
A
The reaction rate depends on the concentration of both the nucleophile and the substrate.
B
The rate-determining step involves the formation of a carbocation intermediate.
C
The mechanism proceeds through a concerted, single-step process.
D
Primary alkyl halides are more reactive than tertiary alkyl halides in reactions.
Verified step by step guidance1
Recall that an SN1 reaction mechanism involves two main steps: first, the leaving group departs, forming a carbocation intermediate; second, the nucleophile attacks the carbocation.
Understand that the rate-determining step in an SN1 reaction is the formation of the carbocation intermediate, which depends only on the concentration of the substrate, not the nucleophile.
Recognize that because the rate-determining step is unimolecular, the overall rate law is first order with respect to the substrate and zero order with respect to the nucleophile concentration.
Note that SN1 reactions proceed through a stepwise mechanism, not a concerted single-step process, distinguishing them from SN2 reactions.
Remember that tertiary alkyl halides are more reactive in SN1 reactions due to the greater stability of the tertiary carbocation intermediate compared to primary carbocations.
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