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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3st110

A Newman projection of a molecule (a specific stereoisomer) is drawn in one staggered conformation. Which statements are correct?

  1. ARotating the rear carbon by gives a different conformer of the same stereoisomer.
  2. BInterchanging H and Cl on the front carbon gives a conformer of the same stereoisomer.
  3. CViewing the same molecule from the opposite end gives a projection of the same stereoisomer.
  4. DRotating the rear carbon by gives the enantiomer.

Answer: A, C

Rotation about the C2-C3 single bond changes only the conformation, so the first statement is true. Interchanging two groups on a stereocentre changes the configuration, so the second is false. Viewing from the other end is the same molecule seen from a different direction, so the third is true. A rotation gives an eclipsed conformer of the same compound, not the enantiomer.
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