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Which one of the following sets of monosaccharides forms sucrose?

1. α-D-Galactopyranose and α-D-Glucopyranose
2. α-D-Glucopyranose and β-D-Fructofuranose
3. β-D-Glucopyranose and α-D-Fructofuranose
4. α-D-Glucopyranose and β-D-Fructopyranose

Correct answer: α-D-Glucopyranose and β-D-Fructofuranose

Solution

Sucrose is formed by the glycosidic linkage between α-D-Glucopyranose and β-D-Fructofuranose. This is a well-established fact in carbohydrate chemistry.

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