Identify the correct structure of -D-glucopyranose.

Step-by-step solution

The open-chain structure of D-glucose has the hydroxyl (-OH) groups at C2, C3, and C4 positions oriented as right, left, and right, respectively, in the Fischer projection. When D-glucose forms a cyclic hemiacetal (glucopyranose), the -OH group at C5 attacks the aldehyde carbon at C1, forming a six-membered ring. For the -anomer of D-glucopyranose, the newly formed -OH group at C1 is on the same side as the ring oxygen in the Fischer projection, which is on the right side. Checking the configuration at each carbon