i. More than one Fischer projection can be drawn to represent a given molecule. Lactic acid (1) exists as a pair of enantiomers: (R)-lactic acid and (S)-lactic acid.
1) How many Fischer projections can be drawn to represent (R)-lactic acid?
2) Draw them.
ii. Determine whether the two Fischer projections are identical, constitutional isomers, enantiomers, or diastereomers.