NEET 2012 Chemistry question

Which one of the following sets of monosaccharides forms sucrose?

(1)-D-Glucopyranose and -D-fructopyranose
(2)-D-Galactopyranose and -D-Glucopyranose
(3)-D-Glucopyranose and -D-fructofuranoseCorrect
(4)-D-Glucopyranose and -D-fructofuranose

Answer: (3)

Solution

Sucrose is a non-reducing disaccharide formed from -D-glucopyranose and -D-fructofuranose joined by an -1,2-glycosidic linkage between C-1 of glucose and C-2 of fructose; both anomeric carbons are involved in the bond, so sucrose is

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Question ID VK-091121