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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm054

Which statements about sucrose are correct?

AThe glucose unit is present as a pyranose ring.
BThe fructose unit is present as a pyranose ring.
CThe glycosidic bond links C-1 of alpha-D-glucose to C-2 of beta-D-fructose.
DNeither ring has a free hemiacetal or hemiketal OH group.

Answer: A, C, D

In sucrose, glucose is a pyranose and fructose is a furanose, so the pyranose statement for fructose is false. The bond uses both anomeric carbons, so neither ring is free to open.

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