Question
Which one of the following sets of monosaccharides forms sucrose?
- α-D-galactopyranose and α-D- glucopyranose
- α-D-glucopyranose and β-D-fructofuranose
- β-D-glucopyranose and α-D-fructofuranose
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α-D-glucopyranose and β-D-fructopyranose
Solution
B.
α-D-glucopyranose and β-D-fructofuranoseSucrose is composed of α-D-glucopyranose and β-D-fructofuranose units which are joined by α, β-glycosidic linkage between C-1 of the glucose unit and C-2 of the fructose unit.
