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Which of the following disaccharides does not consist of two glucose units?

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in Chemistry – Class 12 by (188k points)
Which of the following disaccharides does not consist of two glucose units?

(a) Trehalose

(b) Cellobiose

(c) Isomaltose

(d) Lactulose

This question was posed to me in an internship interview.

This intriguing question comes from Biomolecules Carbohydrates in portion Biomolecules of Chemistry – Class 12

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The correct answer is (d) Lactulose

To elaborate: Lactulose is a disaccharide which is composed of two different monosaccharide units namely, galactose and fructose. Whereas trehalose, cellobiose and isomaltose are disaccharides consisting of two glucose units.

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