Glucose, galactose, and fructose are all hexoses. They are structural isomers, meaning they have the same chemical formula (C6H12O6) but a different atom arrangement.

Question

What kind of sugars are these, aldose or ketose?

Answer 1

Glucose and galactose are classified as aldoses because they contain an aldehyde functional group. Fructose, on the other hand, is a ketose because it contains a ketone functional group. So, to summarize:

• Glucose: Aldose
• Galactose: Aldose
• Fructose: Ketose