Define fehlings test A&B

Dear Student,

The Fehling’s test is a test which is used to distinguish between aldehydes and ketones. It is a mild oxidizing agent which oxidizes aldehydes but not ketones. Therefore, ketones do not give this test. The general equation for this reaction is written as follows

The Fehling solution has two components–

Fehling solution A and Fehling solution B. Fehling solution A is Copper sulphate solution and Fehling solution B is Sodium Potassium tartarate (also known as Rochelle salt). When a few drops of the Fehling's solution are added to the Aldehyde in a test tube and it is gently heated, a red coloured precipitate of Cu₂O is formed.

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