Question

When the only difference between two Fischer projections is that the projection appears to have rotated 90 degrees, what is the relationship between the structures represented?

a) Constitutional isomers

b) Enantiomers

c) Diastereomers

d) Identical structures

Answer 1

The relationship between two Fischer projections that appear to have rotated 90 degrees is diastereomers.

Step-by-step explanation:

When the only difference between two Fischer projections is that the projection appears to have rotated 90 degrees, the relationship between the structures represented is diastereomers. The relationship between two Fischer projections that appear to have rotated 90 degrees is diastereomers.

Diastereomers are stereoisomers that are not mirror images of each other. They have different chemical and physical properties and can exhibit different reactivity. In a Fischer projection, when the projection is rotated 90 degrees, the stereochemistry of the molecule changes, resulting in diastereomers.