Which of the Following is a Diastereomer of D-Mannose

Question

Which of the following is a diastereomer of D-mannose?
A)D-gulose
B)D-altrose
C)D-idose
D)D-talose
E)all of the above

Accepted Answer

Diastereomers are stereoisomers that are not mirror images of each other. D-Mannose and all the listed sugars (D-gulose, D-altrose, D-idose, D-talose) have the same molecular formula but differ in the configuration of at least one chiral center without being mirror images, making them diastereomers of each other.