Which of the following reagents can be used to distinguish between acetaldehyde and acetone?
Correct: D
Acetaldehyde, being an aldehyde, will reduce Tollen's reagent and Fehling's solution, forming a silver mirror or a red precipitate of Cu2O, respectively. Acetone, being a ketone, does not reduce these reagents. I2/NaOH (iodoform test) will also distinguish, with acetaldehyde giving a positive test (yellow precipitate of iodoform). Therefore, all are valid