Question

Which 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 \( \beta \)-glycoside formed by the union of one 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.

Hint:

Reducing sugars like lactose exhibit mutarotation, which involves the interconversion of anomeric forms.

Answer 1

The Correct Option is C

Step 1: Understand the properties of Lactose.
Lactose is a reducing sugar, meaning it can reduce other substances and undergo mutarotation, where its specific rotation changes as the anomeric forms interconvert.
Step 2: Conclusion.
Thus, \( (+) \) Lactose does exhibit mutarotation, and statement (3) is incorrect.
Final Answer: \[ \boxed{(+)\text{Lactose is a reducing sugar and does not exhibit mutarotation.}} \]