NEET 2011 Chemistry question

Which one of the following statements is not true regarding (+) Lactose ?

(1)On hydrolysis (+) Lactose gives equal amount of D(+) glucose and D(+) galactose.
(2)(+) Lactose is a -glycoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose.
(3)(+) Lactose is a reducing sugar and does not exhibit mutarotation.Correct
(4)(+) Lactose, contains 8-OH groups.

Answer: (3)

Solution

Lactose is the disaccharide in which C-1 of -D-galactose is joined to C-4 of D-glucose through a -glycosidic link, so on hydrolysis it gives equal amounts of D(+)-glucose and D(+)-galactose (statements 1 and 2 are true). The glucose unit retains a free hemiacetal

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Question ID VK-090789