(a) Fehling solution : CuSO4+ Sod. - Pot. tartarate (Rochelle salt) gives red ppt. of Cu2O with glucose and fructose both. (b) Barfoed reagent: 7%(CH3COO)2Cu+1%CH3COOH+92%H2O gives red ppt. of Cu2O with both. (c) Benedict reagent: CuSO4+ Sod. citrate +Na2CO3 also gives red ppt. of Cu2O with both. (d) Seliwanoff's reagent: Resorcinol in conc. HCl gives red colour with both, but a ketose (fructose) reacts more quickly than an aldose (glucose).