SATHEE: Biomolecules - Result Question 5

Biomolecules - Result Question 5

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

[2011]

(a) On hydrolysis (+) Lactose gives equal amount of $D (+)$ glucose and $D (+)$ galactose.

(b) (+) Lactose is a $β$ -glycoside formed by the union of a molecule of $D (+)$ glucose and a molecule of $D (+)$ galactose.

(d) (+) Lactose, $C_{12} H_{22} O_{11}$ contains $8 - O H$ groups.

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Solution:

Reducing sugars have hydroxyl group at the anomeric $C 1$ position. In solution, a carbohydrate can open up to its aldehyde form. Hence, it can switch configuration between $α -$ and $β -$ forms.

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Biomolecules - Result Question 5

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