Question

Which carbohydrate in question would reduce fehling's solution?

Answer 1

A reducing sugar such as glucose, fructose, galactose, maltose, or lactose would reduce Fehling's solution, causing it to change color, indicating the presence of these sugars.

Step-by-step explanation:

The carbohydrate that would reduce Fehling's solution is a reducing sugar. Reducing sugars are carbohydrates with a free aldehydic or ketonic group that are capable of acting as reducing agents. These sugars include all monosaccharides such as glucose, fructose, and galactose, and some disaccharides like maltose and lactose.

In the context of a Fehling's test, which is an analytical chemistry procedure used to detect the presence of reducing sugars, these carbohydrates reduce the copper(II) ions present in Fehling's solution to insoluble copper(I) oxide that is red or brick-red in color. This color change is evidence of a positive test result, indicating the presence of a reducing sugar in the sample being tested.

Answer 2

The carbohydrate what would be able to reduce Fehling's solution would be polyhydroxy aldehydes. For example, lactose and other aldoses. These substances reduces the reagent into a red precipitate which is Cu2O.  Hope this helps.