Question

The glycosidic linkage present in sucrose is between:
A. C – 1 of $$\alpha$$- glucose and C – 2 of $$\beta$$- fructose
B. C – 1 of $$\beta$$- galactose and C – 4 of $$\alpha$$- glucose
C. C – 1 of $$\alpha$$- glucose and C – 4 of $$\beta$$- fructose
D. C – 1 of $$\alpha$$- glucose and C – 4 of $$\alpha$$- glucose

Answer 1

Hint: Glycosidic linkages are generally found in sugars like sucrose. The combination of one or more types of monosaccharides forms new molecules through a glycosidic linkage. By identifying the monosaccharides used in sucrose, we can get the glycosidic linkage.

Complete answer: The glycosidic linkage present in sucrose is the first option that is C – 1 of $$\alpha$$- glucose and C – 2 of $$\beta$$- fructose.
Glycosidic linkage can be defined as head to head linkage. The monomers so called glucose and fructose complete the linkage in sucrose. It is linked through an ether bond between C1 on the glucosyl subunit and C2 on the fructosyl unit. Sucrose is a disaccharide, a molecule which is composed of two monosaccharides. The molecular formula of sucrose is $${\text{C}}_{12}{\text{H}}_{22}{\text{O}}_{11}$$. So, the answer is the first option. Remaining options are wrong because the linkages are not correct and the monosaccharides used are not correct.
So, the correct answer is “Option A”.

Additional Information: Its appearance is like white solid. The crystal structure is monoclinic. It is generally present in plants.

Note: Sucrose is the largest – selling pure organic compound in the world. It has another name as beet sugar, cane sugar, table sugar etc. As the fruits become ripe, the sucrose content will also increase. Some fruits do not contain sucrose at all.