?-D-Glucopyranose in the chair form is the most widely occurring form of glucose in nature.Which of the following is one of its characteristics?
A)The anomeric carbon has a hydroxyl that is below the plane of the chair.
B)It forms a 5-membered ring.
C)Carbon 6 is below the plane of the chair.
D)All the -OH groups are equatorial.

Question

Quizplus · Accepted Answer

The chair form of b-D-Glucopyranose has all the -OH groups in the equatorial position, which provides maximum stability to the molecule. The anomeric carbon, which is carbon #1, has a hydroxyl group above the plane of the chair in the b-form and below the plane of the chair in the a-form. Carbon #6 is above the plane of the chair. Furthermore, glucose forms a 6-membered ring, not a 5-membered ring.

?-D-Glucopyranose in the Chair Form Is the Most Widely Occurring