To distinguish aldehyde from ketone which solution is used:

Explanation

To distinguish between an aldehyde and a ketone, we can use Fehling solution. Fehling solution is a mixture of two solutions: Fehling solution A, which contains copper sulfate, and Fehling solution B, which contains sodium hydroxide and potassium tartrate. When we add Fehling solution to a solution containing an aldehyde, like formaldehyde or acetaldehyde, a red precipitate of copper(I) oxide is formed. However, if we add Fehling solution to a solution containing a ketone, like acetone or propanone, no reaction occurs. So, by using Fehling solution, we can differentiate between aldehydes and ketones.