When a monosaccharide reacts to give the pyranose form from its open-chain form, how many distinct pyranose forms are possible?

Question

Quizplus · Accepted Answer

When a monosaccharide reacts to give the pyranose form, it forms a six-membered ring structure with five carbon atoms and one oxygen atom. There are two possible ways in which the ring can form, either with the hydroxyl group on the anomeric carbon pointing up or down. Therefore, two distinct pyranose forms are possible.

When a Monosaccharide Reacts to Give the Pyranose Form from Its