Question

The number of carbon atoms in the ring of the $\alpha$-D-glucopyranose is:

• A. 3
• B. 4
• C. 5
• D. none of these

Answer 1

The correct option is C 5

There are 5 carbon atoms in the ring of $\alpha$-D-glucopyranose. The sixth member of the ring is oxygen atom. The structure is very similar to the pyran hence it is called as glucopyranose.