Question

The correct statement about the following disaccharide is:

• A. Ring (a) is pyranose with $\alpha$ - glycosidic link
• B. Ring (a) is furanose with $\alpha$ - glycosidic link
• C. Ring (b) is furanose with $\alpha$ - glycosidic link
• D. Ring (b) is pyranose with $\beta$ - glycosidic link

Answer 1

The correct option is A Ring (a) is pyranose with $\alpha$ - glycosidic link

The six-membered cyclic ether is known as pyranose while the five membered cyclic ether is known as furanose. Hence, ring (a) is a pyranose and it has ether linkage at $\alpha -$ position that is known as $\alpha -$ glycosidic linkage.