Lactose is made of:

α - D

-glucose only

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α - D

-glucose only and

β - D

-glucose

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α - D

-galactose and

β - D

-glucose

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β - D

-galactose and

β - D

-glucose

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Solution

The correct option is D $β - D$ -galactose and $β - D$ -glucose
Lactose is made up of $- β - D -$ galactopyranosyl $- (1 \to 4) - D -$ glucose. Hence answer D is correct.
Although, glucose can be in alpha or beta anomeric form and that will decide the alpha or beta Lactose. But since only lactose, in general, has been asked then answer D is correct.

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Similar questions

Regarding lactose, some statements are given below

A) On hydrolysis, lactose gives β-D-galactose and β-D-glucose

B) In lactose C₁ of β-D-galactose has acetal structure and C₁ of β-D-glucose has hemiacetal structure

C) In lactose molecule, β-D-galactose is a non-reducing unit and β-D-glucose is reducing unit

The correct statements are

Match the List-I and List-II:

List I (Saccharides)	List II (Formed by)
(A) Sucrose	(i) $β$ -D glucose $C_{1} - C_{4}$ glycosidic linkage
(B) Lactose	(ii) $α$ -D glucose, $β$ -D fructose $C_{1} - C_{2}$ glycosidic linkage
(C) Cellulose	(iii) $β$ -D glucose, $β$ -D galactose $C_{1} - C_{4}$ glycosidic linkage

Regarding lactose, some statements are given below

A) On hydrolysis, lactose gives β-D-galactose and β-D-glucose

B) In lactose C₁ of β-D-galactose has acetal structure and C₁ of β-D-glucose has hemiacetal structure

C) In lactose molecule, β-D-galactose is a non-reducing unit and β-D-glucose is reducing unit

The correct statements are

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