Six-membered cyclic hemiacetals and five-membered cyclic hemiacetals are called, respectively, none of the above.
Explanation:
Pyranoses and furanoses are the terms used to mention the six-membered cyclic hemiacetals and five-membered cyclic hemiacetals respectively.
Pyranose is a saccharide having a chemical structure that includes a six-membered ring. One oxygen atom and five carbon atoms are present in the six-membered ring. The external part of the ring may have some carbons.
The carbohydrates having a chemical structure with a five-membered ring system is known as furanoses. One oxygen atom and four carbon atoms and are present in the five-membered ring system. There is no chance of double bonds in the furanose ring.
