Draw the structure of a disaccharide formed from two mannose units joined by a $\mathbf{1}\mathbf{-}\mathbf{4}\mathbf{\to }\mathbf{\alpha }$glycosidic linkage.

Disaccharides constitute sugars generated when two monosaccharides are connected via a glycosidic linkage. Some examples of monosaccharides include maltose and lactose.

Glycosidic linkage or glycosidic bond constitutes a covalent bond that links a carbohydrate to another molecule. Molecules comprising a glycosidic bond are termed glycosides.

The structure of a disaccharide generated by linking two mannose units is:

Disaccharides formed from two mannose units

The disaccharide is produced by alpha linkage as the -OH group is located below the ring. The formation of disaccharides also involves a condensation reaction. The water molecules are eliminated in the condensation reactions.

The structure of the mannose is:

Structure of mannose