The ring form with the ring structure shown at left below is called a ________, and the ring form with the ring structure to the right below is called a _________.
A) pyranose; pyranose
B) pyranose; furanose
C) furanose; furanose
D) furanose; pyranose
E) The choices given do not apply to ring forms of sugars.

Question

The ring form with the ring structure shown at left below is called a ________, and the ring form with the ring structure to the right below is called a _________. 
A) pyranose; pyranose 
B) pyranose; furanose 
C) furanose; furanose 
D) furanose; pyranose 
E) The choices given do not apply to ring forms of sugars.

Quizplus · Accepted Answer

The ring form with the ring structure shown at left is a pyranose because it has a six-membered ring (pyran) structure. The ring form with the ring structure to the right is a furanose because it has a five-membered ring (furan) structure. Therefore, the best choice is D.

The Ring Form with the Ring Structure Shown at Left