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

1. (+) lactose is a $\beta$-glycoside formed by the union of a molecule of $D(+)$ glucose and a molecule of $\mathrm{D}(+)$ galactose
2. (+) lactose is a reducing sugar and does not exhibit mutarotation
3. (+) lactose, $\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}$ contains 8-O $\mathrm{H}$ groups
4. On hydrolysis (+) lactose gives equal amount of $\mathrm{D}(+)$ glucose and $\mathrm{D}(+)$ galactose

Solution

Lactose is a reducing sugar and all reducing sugars show mutarotation.

Asked in: NEET 2011 (Screening)

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