Which of the Following Monosaccharides is a Ketose

Question

Which of the following monosaccharides is a ketose?
A) arabinose
B) ribose
C) xylose
D) lyxose
E) none of them

Accepted Answer

All the options listed (arabinose, ribose, xylose, and lyxose) are aldoses, not ketoses. Ketoses have a ketone functional group, whereas aldoses, like the ones listed, have an aldehyde group.