The correct statement about the following disaccharide is–

Options

A. Ring (I) is pyranose with `alpha` -glycosidic link
B. Ring (I) is furanose with `alpha` -glycosidic link
C. Ring (II) is furanose with `alpha`-glycosidic link
D. Ring (II) is pyranose with `alpha` -glycosidic link

Answer

A

Explanation

In the given structure, ring one (I) has one o-atom and is a 6 membered ring, thus is called pyranose ring, whereas ring (II) has one o-atom and is a five membered ring, thus is called furanose.
The disaccharide is linked by a glycosidic bond between C—1 of glucose (in the `alpha`-position, `alpha` linkage) and C—2 of fructose (in the `beta`-position, `beta`-linkage).