Question

Which of the following statement(s) is/are true?
POS - Plane of symmetry
COS - Centre of symmetry

• A. Stereoisomers containing exactly opposite R-S configurations with POS or COS, are identical.
• B. Stereoisomers containing opposite R/S configuration without symmetry in molecule, are diastereomers.
• C. If few wedge bonds (not all) are converted into dash bonds in an optically active molecule, then they are diastereomers.
• D. Stereoisomers which are not mirror images are enantiomers.

Answer 1

Answer: (A), (C)

If few wedge bonds (not all) are converted into dash bonds in an optically active molecule, then they are diastereomers.

Stereoisomers containing exactly opposite R-S configurations with plane of symmetry or centre of symmetry are identical.

Stereoisomers containing exactly opposite R/S configuration with no POS or COS, are enantiomers.

If few wedge bonds (not all) are converted into dash bonds in an optically active molecule, then they are diastereomers.

If all wedge bonds are converted into dash bonds in an optically active molecule, then they are enantiomers.

Stereoisomers which are not mirror images are diastereomers.

Hence, statements (a) and (c) are correct.