JEE Advanced · 2010 · 11 Apr 2010 · Paper 1 · Biomolecules

The correct statement about the following disaccharide is

(A)Ring (a) is pyranose with $α$ -glycosidic link✓ Correct
(B)Ring (a) is furanose with $α$ -glycosidic link
(C)Ring (b) is furanose with $α$ -glycosidic link
(D)Ring (b) is pyranose with $β$ -glycosidic link

Answer: (A)

Solution

A pyranose ring is a six-membered ring (5 carbons + 1 oxygen), while a furanose ring is five-membered (4 carbons + 1 oxygen). In the given disaccharide structure, ring (a) is a six-membered pyranose ring. The glycosidic linkage orientation is α when the anomeric –OH (or glycosidic oxygen) is on the opposite side of the ring from the CH₂OH group at the reference carbon. Ring (a) shows this α-configuration at the glycosidic linkage.

JEE Advanced · 2010 · 11 Apr 2010 · Paper 1 · Single correct option

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