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Multiple Choice
Which of the following reactions is an example of a nucleophilic substitution reaction in organic chemistry?
A
E1 reaction
B
SN1 reaction
C
Addition reaction
D
E2 reaction
Verified step by step guidance
1
Understand the concept of nucleophilic substitution reactions: These reactions involve the replacement of a leaving group by a nucleophile. They are characterized by the presence of a nucleophile, a substrate with a good leaving group, and the formation of a new bond between the nucleophile and the substrate.
Differentiate between SN1 and SN2 reactions: SN1 reactions are unimolecular nucleophilic substitution reactions where the rate-determining step involves the formation of a carbocation intermediate. SN2 reactions are bimolecular and involve a direct displacement of the leaving group by the nucleophile in a single step.
Identify the characteristics of an SN1 reaction: In an SN1 reaction, the reaction rate depends only on the concentration of the substrate. The reaction typically occurs in two steps: (1) the leaving group departs, forming a carbocation, and (2) the nucleophile attacks the carbocation.
Compare with other reaction types: E1 reactions involve elimination with a carbocation intermediate, similar to SN1 but result in the formation of a double bond. E2 reactions are bimolecular eliminations that occur in a single step. Addition reactions involve adding atoms or groups to a molecule, typically across a double bond.
Conclude that the SN1 reaction is a nucleophilic substitution reaction: Based on the characteristics and mechanism, the SN1 reaction fits the definition of a nucleophilic substitution reaction, as it involves the substitution of a leaving group by a nucleophile through a carbocation intermediate.