Fehling’s Solution gives red precipitate with

Fehling solution: alkaline solution of CuSO₄ containing Rochelle salt (sodium potassium titrate), a mild oxidizing agent aliphatic gives red ppt. ( Cu₂O) (cuprous oxide) with  
Fehling solution
$\mathrm{RCHO}+{\mathrm{Cu}}^{+2}\to {\mathrm{RCOO}}^{-}+{\mathrm{Cu}}_2\mathrm{O}\left(\mathrm{Red}\right)$