Question

In disaccharides, if the reducing groups of monosaccharides,
i.e., aldehydic or ketonic groups are bonded, these are nonreducing
sugars. Which of the following disaccharide is a
non-reducing sugar?

Answer 1

Explanation:

Sucrose is not a reducing sugar because it lacks the ability to form either aldehyde or a ketone in a basic solution. It cannot perform as a reducing agent in solutions at a pH above 7. Reducing capability is defined by the presence of free or potential aldehyde or ketone group. All monosaccharides have free ketone or aldehyde group. This means that they are all reducing sugars. Sucrose's anomeric carbon is not free since this carbon is used to link fructose and glucose together therefore, this anomeric carbon can't open up the ring structure and react with the reagent

Answer 2

Option -B represents  non reducing sugars.

Step by step explanation:

• A reducing of sugar is any sugar which may serve as a reduction agent .
• It has a free group of  free aldehyde and  keto groups.
• All monosaccharides are act as reducing sugars.
• Along with some disaccharides, some oligosaccharides are act as reducing  sugars.
• Non-reducing sugars do not have an  free OH group attached to the anomeric carbon atom.
• Most of the disaccharides are reducing sugars.
• Among the given option , B- structure $\alpha -D-Glucose$ and $\beta - D- Glucose$ connected by the glycosidic linkage and strucutre is called as sucrose.
• It does'nt have free -OH groups to reduce. Hence, it is a non -reducing sugar.

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