Q.The reagent used to distinguish between acetaldehyde and benzaldehyde is a) Tollens' reagent b) Fehling's solution c) 2,4-dinitrophenylhydrazine d) semicarbazide

Three tests exploit an aldehyde's ready oxidisability by a mild metal-ion oxidant that visibly reduces: Tollens' reagent (ammoniacal AgNO3) is reduced to a metallic SILVER MIRROR; Fehling's solution (CuSO4 + alkaline sodium potassium tartrate) and Benedict's s …