Which reagent produces similar results with both butanone and butanal?
- Aacidified aqueous potassium dichromate(VI)
- Ban alkaline solution containing complexed $\text{Cu}^{2+}$ ions (Fehling’s solution)
- Can aqueous solution containing $[\text{Ag}(\text{NH}_3)_2]^+$ (Tollens’ reagent)
- D2,4-dinitrophenylhydrazine reagent