Question

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

• A. On hydrolysis (+) Lactose gives equal amount of D(+) glucose and D(+) galactose.
• B. (+) Lactose is a P-glycoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose.
• C. (+) Lactose is a reducing sugar and does not exhibit mutarotation.
• D. (+) Lactose, $C_{12}{H}_{22}{O}_{11}$ contains 8-OH groups.

Answer 1

Answer: (C)

$(C)(+)$ Lactose is a reducing sugar and does not exhibit mutarotation $(+)$ Lactose is a reducing sugar and exhibits mutarotation by virtue of the anomeric $C-1$ of the glucose residue.