Question

Which can exist both as diasterioisomers and enantiomers

Answer 1

Answer:

The molecules with only one stereocenter that differs (parallel arrows) are diastereomers. A biological example of this is saccharide (or sugar) chemistry and below is the enantiomers and diastereomers of threose. While enantiomers can only come in pairs, many diastereomers can exist for a given molecule.

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