JEE Main Chemistry question

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

(A)(+)-Lactose, , contains 8 groups
(B)On hydrolysis, (+)-lactose gives equal amounts of D(+)-glucose and D(+)-galactose
(C)(+)-Lactose is a -glycoside formed by the union of a molecule of D(+)-glucose and a molecule of D(+)-galactose
(D)(+)-Lactose is a reducing sugar and does not exhibit mutarotationCorrect

Answer: (D)

Solution

Lactose, built from -D-galactose linked () to D-glucose, retains a free anomeric on the glucose unit, making it a reducing sugar that genuinely does exhibit mutarotation; the claim that it "does not exhibit mutarotation" is therefore

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Question ID VK-151133