CUSAT 2021 BTech Solved Paper Shift 2

An organic compound P with molecular formula C8H8O forms an orange-red precipitate with 2,4-dinitrophenylhydrazine and yellow precipitate on heating with iodine in the presence of NaOH. It does not reduce Tollens' or Fehling's reagent and it does not decolorize bromine water. When treated with zinc-amalgam and con. HCl, it gives a compound Q with molecular formula C8H10. The compounds P and Q are