Glycosidic linkage between C _ 1 of α -glucose and C _ 2 of β...

Sucrose

Sucrose is composed of a molecule of glucose joined to a molecule of fructose by an $\alpha - 1, \beta - 2$-gIycosidic linkage.

Mannose is a sugar monomer of the aldohexose series of carbohydrates. It is a $C - 2$ epimer of glucose.

Fructose, or fruit sugar, is a ketonic simple sugar found in many plants, where it is often bonded to glucose to form the disaccharide sucrose.

Lactose is composed of a molecule of galactose joined to a molecule of glucose by a $\beta - 1, 4$-gIycosidic linkage. It is a reducing sugar that is found in milk.