Tollen’s reagent can oxidize both aliphatic and aromatic aldehyde ∴It cannot be used to distinguish acetaldehyde and benzaldehyde.Fehling’s reagent can oxidise only aliphatic aldehydes but not aromatic aldehydesAcetaldehyde gives positive haloform test but not BenzaldehydeBoth Acetaldehyde & Benzaldehyde give positive 2, 4-DNP test.A & D  – falseB & C – true