An aromatic compound (X) (C8H8O) gives positive 2,4-DNP test. It gives a yellow precipitate of compound (Y) on reaction with iodine and sodium hydroxide solution. (X) does not give Tollen's test on oxidation under drastic conditions. It gives a carboxylic acid (Z) (C7H6O2). (Z) is also formed with (Y) during the reaction. (X), (Y) and (Z) respectively are: