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MCAT Organic Chemistry Question — Molecules

All of the following molecules are identical EXCEPT:


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This question asks the examinee to determine the molecule that has a relative configuration different than the others. The best method to answer this question is to determine the absolute configuration of each molecule. Choices A, C, and D have an absolute configuration of S, while choice B has an absolute configuration of R. Thus, the molecules shown in A, C, and D are identical while the molecule shown in B is the enantiomer. Choice B is the correct answer.

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