Question

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

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

Answer 1

Answer: (B)

$(+)$ lactose is a reducing sugar and does not exhibit mutarotation

Answer 2

Lactose is a reducing sugar and all reducing sugars show mutarotation