Molecular formula of ‘A’ C8H8O . ‘A’  gives ppt with 2, 4 DNP. ‘A’ gives yellow crystals with NaOH+I2 . ‘A’ does not gives Tollen's (or) Fehling test. It neither ‘decolourise Br2 / H2O nor Baeyer’s reagent. On oxidation with chromic acid 'A' gives C7H6O2. A & B are