Which one of the following statement is not true? (A) Lactose contains -glycosidic linkage between C1 of galactose and c4 of glucose (B) On acid hydrolysis, lactose gives one molecule of D(+) – glucos

Question

Which one of the following statement is not true?

(A) Lactose contains -glycosidic linkage between C1 of galactose and c4 of glucose
(B) On acid hydrolysis, lactose gives one molecule of D(+) – glucose and one molecule of D(+)-galactose.
(C) Lactose is a reducing sugar and it gives Fehling's test.
(D) Lactose (C11H22O11) is a disaccharide and it contains 8 hydroxyl groups.

Prashant Kotian · Accepted Answer

Correct answer: A. The linkage is between C-1 of Galactose and C-4 of Glucose Lactose (Milk sugar) H O   -galactose + -glucose (C12H22O11) It is hydrolysed by dilute acids or by the enzyme lactase, to an equimolecular mixture of D(+)-glucose and D(+)-galactose. Lactose is a reducing sugar.

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