When sugar 'X' is boiled with dilute in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with yields saccharic acid whereas 'B' is laevorotatory. The compound 'X' is

Question

When sugar 'X' is boiled with dilute  in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with  yields saccharic acid whereas 'B' is laevorotatory. The compound 'X' is

Canvas Classes · Accepted Answer

Identifying sugar X:

Clue 1: Hydrolysis gives two isomers A and B
X is a disaccharide that gives two different monosaccharides on hydrolysis.

Clue 2: A on oxidation with HNO₃ gives saccharic acid
Saccharic acid (glucaric acid) is obtained by oxidation of glucose with HNO₃ (both –CHO and –CH₂OH oxidized to –COOH). So A = glucose.

Clue 3: B is laevorotatory
- Glucose is dextrorotatory (+52.7°)
- Fructose is laevorotatory (−92.4°) → B = fructose

Conclusion: X hydrolyses to glucose + fructose →

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