Question

from the following precursors bio molecules
D-glucose,D-fructose,D-galactose ,
1_reducing disaccharide(give systematic or common name of the compound)

Answer 1

Disaccharide that consists of b-D-galactose and b-D-glucose will have name b-1,4-glycoside
Disaccharide that consists of a-D-glucose and b-D-fructose will have name a-1,2-glycoside

Lactose, also known as milk sugar, is a galactose-glucose compound joined as a beta-glycoside. It is a reducing sugar because of the hemiacetal function remaining in the glucose moiety.

Sucrose, or cane sugar, is our most commonly used sweetening agent. It is a non-reducing disaccharide composed of glucose and fructose joined at the anomeric carbon of each by glycoside bonds (one alpha and one beta). In the formula shown here the fructose ring has been rotated 180º from its conventional perspective.