Question:

Which of the following is the correct structure for the given organic compound, based on the type of substitution in an S\(_N\)2 reaction?

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In S\(_N\)2 reactions, the nucleophile attacks from the opposite side of the leaving group, leading to a backside attack and inversion of configuration.
Updated On: Jan 20, 2026
  • 1-Bromo-2-chloro-3-butene
  • 1-Bromo-2-chloro-4-butene
  • 1-Bromo-3-chloro-2-butene
  • 1-Bromo-3-chloro-5-butene
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The Correct Option is A

Solution and Explanation


Step 1: Understanding the Problem.
The question asks for the correct organic structure for a compound undergoing an S\(_N\)2 reaction, which is a bimolecular nucleophilic substitution. In such reactions, the nucleophile attacks the electrophilic carbon while the leaving group departs.
Step 2: Analyzing the Options.
- (A) 1-Bromo-2-chloro-3-butene is the correct structure that fits the S\(_N\)2 reaction conditions as it provides the right positioning of substituents for substitution at the electrophilic carbon.
- (B), (C), and (D) are incorrect because they involve improper positions for the leaving groups, which would make the S\(_N\)2 mechanism less favorable.
Step 3: Conclusion.
The correct answer is (A) 1-Bromo-2-chloro-3-butene as it follows the proper structural formation for an S\(_N\)2 reaction.
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