When ethanal is treated with Fehling’s solution, it gives a precipitate of (AFMC 2010)

Fehling’s test is used for the presence of aliphatic aldehyde in the compound. Alkaline solution of 4 CuSO containing some Rochelle salt is known as Fehling’s solution. When the aliphatic aldehyde like ethanal, is treated with Fehling’s solution, red ppt. is formed. And this red precipitate is formed by the compound cuprous oxide having formula ( 2 Cu O ).