Which of the following is D-sorbose?

Question

Quizplus · Accepted Answer

D-sorbose has a 2-hydroxyl group (OH) on the second carbon from the top in its Fischer projection, and a ketone functional group (C=O) on the bottom-most carbon. Only structure II matches this description. Structures I and IV have a hydroxyl group on the bottom-most carbon, while structure III has a hydroxyl group on the second carbon from the top and an aldehyde functional group (CHO) on the bottom-most carbon. Therefore, only structure II is D-sorbose.

Which of the Following Is D-Sorbose