Question

Which of the following is a reducing sugar?

A
Galactose
B
Gluconic acid
C
βmethyl galactoside
D
Sucrose

Solution

The correct option is B GalactoseSugar is a substance which is crystalline, sweet in taste and soluble in water. A compound which acts as a reducing agent because of the presence of either ketoses or aldoses group forms a reducing sugar. All monosaccharides (cannot be hydrolyzed further) come under reducing sugar.  Disaccharides which have aldehydic and ketonic group free, act as reducing sugars eg: maltose and lactose. Galactose( $$C_6H_{12}O_6$$) is a monosaccharide. It is as sweet as glucose. As shown in the above fig, the structure of galactose is same as that of glucose, but it differs in the arrangements of atoms. Since it is a monosaccharide, it is a reducing sugar.Chemistry

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