A) Ring [A] ispyranonewith\[\alpha -\]glycosidiclink
B) Ring [A] is furanone with \[\alpha -\]glycosidic link
C) Ring [S] is pyranone with \[\beta -\]glycosidic link
D) Ring [B] is furanone with \[\alpha -\]glycosidic link
Correct Answer: A
Solution :
The ring A is pyranone. In \[\alpha -\]type glycosidic linkage, the hydroxyl group (OH) nearer the oxygen atom of ring is written on lower side, whereas in \[\beta -\]type it is written on upper side.
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