Which one of the following is a non - reducing carbohydrate?

M a l t o s e

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S u c r o s e

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L a c t o s e

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R i b o s e

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Solution

The correct option is B $S u c r o s e$
A non-reducing sugar is a carbohydrate that is not oxidized by a weak oxidizing agent (an oxidizing agent that oxidizes aldehydes but not alcohols, such as the Tollen's reagent) in basic aqueous solution. The characteristic property of non-reducing sugars is that, in basic aqueous medium, they do not generate any compounds containing an aldehyde group. Example : sucrose, which contains neither a hemiacetal group nor a hemiketal group and, therefore, is stable in water.

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Classify the following into monosaccharides and disaccharides.

Ribose, 2-deoxyribose, maltose, galactose, fructose and lactose

QUESTION 14.4

Classify the following into monosaccharides and disaccharides, Ribose, 2- deoxyribose, maltose, galactose, fructose and lactose.

Which one of the following pairs of nutrients includes both as simple sugars (monosaccharides) ?

(a) Sucrose and glucose

(b) Glucose and maltose

(d) Maltose and lactose

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