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NEET levelSingle correct optionDifficulty 1 of 3st011

Which of the following molecules is achiral?

A $(2 R, 3 S)$ -2,3-dibromobutane
B $(R)$ -2-bromobutane
C $(2 R, 3 R)$ -2,3-dibromobutane
D $(2 S, 3 S)$ -2,3-dibromobutane

Answer: A

(2 R, 3 R)

and

(2 S, 3 S)

are a chiral enantiomeric pair, and

(R)

-2-bromobutane has a single stereocentre.

(2 R, 3 S)

-2,3-dibromobutane has opposite configurations on two identical halves and an internal mirror plane, so it is the achiral meso form.

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