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Which one of the following sets of monosaccharides forms sucrose?
A
$\alpha$-D-Glucopyranose and $\beta$-D-fructopyranose
B
$\alpha$-D-Galactopyranose and $\alpha$-D-Glucopyranose
C
$\alpha$-D-Glucopyranose and $\beta$-D-fructofuranose
D
$\beta$-D-Glucopyranose and $\alpha$-D-fructofuranose
Detailed Solution
Sucrose is a disaccharide of glucose and fructose.
C-1 of $\alpha$-D-glucose (six-membered pyranose ring) is joined to C-2 of $\beta$-D-fructose (five-membered furanose ring) by a glycosidic linkage.
So sucrose is formed from $\alpha$-D-glucopyranose and $\beta$-D-fructofuranose.
C-1 of $\alpha$-D-glucose (six-membered pyranose ring) is joined to C-2 of $\beta$-D-fructose (five-membered furanose ring) by a glycosidic linkage.
So sucrose is formed from $\alpha$-D-glucopyranose and $\beta$-D-fructofuranose.