What is the configuration of the following compound?
A)2S,3R
B)3R,3S
C)2S,3S
D)2R,3R
E)Can't do R and S; the compound is achiral.

Question

What is the configuration of the following compound? 
A)2S,3R 
B)3R,3S 
C)2S,3S 
D)2R,3R 
E)Can't do R and S; the compound is achiral.

Quizplus · Accepted Answer

The compound has two stereocenters, one with two different substituents and one with three different substituents. The first stereocenter is designated as 2S because the higher priority substituent (chlorine) is on the same side as the lowest priority substituent (hydrogen). The second stereocenter is designated as 3S because the higher priority substituents (chlorine, methyl, and ethyl) are arranged in a counterclockwise direction. Therefore, the configuration is 2S,3S.

What Is the Configuration of the Following Compound