Glucose can be differentiated from lactose by :

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Tollen's reagent

Fehling solution

Benedict's solution

Barfoed's reagent

answer is D.

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Detailed Solution

Glucose can be differentiated from lactose by Barfoed's reagent.

Copper (II) acetate is dissolved in a 0.33 molar solution in 1% acetic acid to form Barfoed's reagent. Since the reagent does not store well, it is advised to prepare it only when it is truly needed.

Hence, option 4 is correct.

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