Question

A cyclic hemiacetal with a six-membered oxygen-containing ring is referred to as a(n): Select one:

a. aldehyde.
b. pyranose.
c. ketopentose.
d. furanose.
e. sorbitol.

Answer 1

The cyclic hemiacetal with a six-membered oxygen-containing ring is known as a pyranose, which is option b in the provided options.

Step-by-step explanation:

The student asked about the name for a cyclic hemiacetal with a six-membered oxygen-containing ring. In chemistry, a cyclic hemiacetal that includes a six-membered ring structure like that is known as a pyranose. This term originates from the compound pyran, which is a six-membered ether.

Pyranose forms are stable because six-membered rings are preferred due to their lower strain compared to other ring sizes. Glucose, for example, often exists as a cyclic hemiacetal in its pyranose form when in equilibrium with its open-chain form in a water solution. Thus, the correct option for the cyclic hemiacetal with a six-membered oxygen-containing ring is option b. pyranose.