Question

Benedict’s solution is an alkaline copper sulfate solution which is used to detect the presence of aldehyde groups.  In the presence of Benedict’s solution, the aldehyde group is oxidized and the aqueous blue Cu²⁺ion is reduced to a red Cu₂O precipitate.  Sugars such as glucose, which produce the red precipitate when Benedict’s solution is added, are called reducing sugars because they can reduce Cu²⁺to Cu⁺.  Which of the following carbohydrates would give a positive reaction with Benedict’s reagent?

a) Galactose

b) Sorbitol

c) beta-ehtylglucoside

d) Gluconate

Answer 1

Answer)

from above data that

These one carbohydrates would give a positive result with Benedict's solution;

• A) Galactose

Reason-

A reducing sugar has either a free hemiacetal group or an aldehyde group in its open chain conformation.

such side groups get oxidized while they reduce another compound (Benedict's solution, in our case). From the given list, Galactose is the common monosaccharides

which are classified as reducing sugars.

so option A is right answer