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JEE Main levelSingle correct optionDifficulty 2 of 3st067

(2R,3S)-2,3-Dichlorobutane and (2S,3R)-2,3-dichlorobutane are:

  1. Aidentical (the same meso compound)
  2. Bconstitutional isomers
  3. Cdiastereomers
  4. Denantiomers

Answer: A

The compound is symmetric, so its (2R,3S) form has an internal mirror plane. Its mirror image is (2S,3R), but rotating the molecule by shows that (2S,3R) and (2R,3S) describe the same molecule. They are identical and not enantiomers.
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