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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm052

Which statements about lactose are correct?

AIt is a non-reducing sugar.
BIt contains a beta-1,4 glycosidic link from C-1 of galactose to C-4 of glucose.
CHydrolysis gives D-galactose and D-glucose.
DThe glucose unit has a free hemiacetal group at C-1.

Answer: B, C, D

Lactose is beta-D-galactopyranosyl-(1,4)-D-glucose. The galactose C-1 is tied up in the glycosidic bond, but the glucose C-1 is free, so lactose is reducing.

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