TS EAMCET · Chemistry · Biomolecules

Considering the facts that I. sucrose forms glycosidic linkage between \(C_1\) of glucose and \(C_2\) fructose, while II. lactose forms glycosidic linkage between \(\mathrm{C}_1\) of galactose and \(\mathrm{C}_4\) of glucose. Choose the correct statement.

A Both sucrose and lactose are reducing sugars.
B Both sucrose the lactose are non-reducing sugars.
C lactose forms glycosidic linkage betwee \(\mathrm{C}_1\) of galactose and \(\mathrm{C}_4\) of glucose.
D Lactose is reducing sugar and sucrose is non-reducing sugar.

Verified Solution

Answer & Solution

Correct Answer

(D) Lactose is reducing sugar and sucrose is non-reducing sugar.

Step-by-step Solution

Detailed explanation

Sucrose and lactose both are disaccharides. In sucrose, anomeric- \(C_1\) of \(\alpha\)-D-glucose and \(C_2\) of \(\beta\)-D-fructose are blocked by 1, 2-glycosidic linkage. So, it is a non-reducing sugar. In lactose, anomeric \(\mathrm{C}_1\) of \(\beta\)-D-galactose is blocked…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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