Question:
Which of the following is a correct feature of the \(\text{SN}^2\) mechanism?
Which of the following is a correct feature of the \(\text{SN}^2\) mechanism?
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SN2 is a one step process with a pentacoordinate transition state and inversion.
Updated On: Oct 1, 2026
- The \(\text{SN}^2\) mechanism proceeds mainly with racemization.
- The \(\text{SN}^2\) mechanism includes a transition state with penta coordinating carbon.
- The \(\text{SN}^2\) mechanism involves formation of planar carbocation intermediate in the first step.
- The \(\text{SN}^2\) mechanism involves formation of carbocation with \(\text{SP}^2\) hybridized carbon.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
SN2 is a bimolecular, one step substitution in which the nucleophile attacks from the back side as the leaving group departs.
Step 2: Detailed Explanation
The carbon passes through a transition state where it is partly bonded to both the nucleophile and the leaving group, so it is five-coordinate. This gives inversion of configuration, not racemisation. So (B) is correct.
(A) is wrong because racemisation is typical of SN1. (C) and (D) describe a planar \(sp^2\) carbocation formed in the first step, which is the SN1 mechanism.
Final Answer:
The SN2 transition state has a pentacoordinate carbon, option (B). \[ \boxed{\text{Pentacoordinate transition state}} \]
SN2 is a bimolecular, one step substitution in which the nucleophile attacks from the back side as the leaving group departs.
Step 2: Detailed Explanation
The carbon passes through a transition state where it is partly bonded to both the nucleophile and the leaving group, so it is five-coordinate. This gives inversion of configuration, not racemisation. So (B) is correct.
(A) is wrong because racemisation is typical of SN1. (C) and (D) describe a planar \(sp^2\) carbocation formed in the first step, which is the SN1 mechanism.
Final Answer:
The SN2 transition state has a pentacoordinate carbon, option (B). \[ \boxed{\text{Pentacoordinate transition state}} \]
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