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Question

Which of the following is a reducing sugar?


A
Galactose
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B
Gluconic acid
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C
βmethyl galactoside
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D
Sucrose
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Solution

The correct option is B Galactose
Sugar 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.

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Chemistry

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