After the following interchanging of groups in the Fischer projection of 2-bromobutane, the configuration of… · ABC26OR0906
Subject: Organic Chemistry · Chapter: Stereochemistry · Topic: Stereochemistry – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium
After the following interchanging of groups in the Fischer projection of 2-bromobutane, the configuration of (X) and (Y) will be 
(Y)
(Y)(a)$\mathrm{X}=\mathrm{R}, \mathrm{Y}=\mathrm{S}$
(b)$\mathrm{X}=\mathrm{R}, \mathrm{Y}=\mathrm{R}$
(c)$\mathrm{X}=\mathrm{S}, \mathrm{Y}=\mathrm{R}$
(d)$\mathrm{X}=\mathrm{S}; \mathrm{Y}=\mathrm{S}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
The starting 2-bromobutane is R. Each exchange of two groups in a Fischer projection inverts the descriptor, so one swap gives X = S and a second swap gives Y = R (c).
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