Question

A non reducing disaccharide 'A' on hydrolysis with dilute acid gives an equimolar mixture of D-( + )-glucose and D-(-)-Fructose.

A + H₂O + HCl → C₆H₁₂O₆ + C₆H₁₂O₆ 

[α]_D = +66.5°+ 52.5°-92.4°

Identify A. What is the mixture of D-(+)-glucose and D-(-)-Fructose known as ? Name the linkage that holds the two units in the disaccharide.

Answer 1

(i) A-Sucrose (C₁₂H₂₂O₁₁)

The mixture of D-(+)- glucose and D-(-)-Fructose is known as invert sugar.

The linkage which holds the two monosaccharide units through oxygen atom is called glycosidic linkage.