The unknown compounds X and Y, both having molecular formula `C_(4)H_(8)O`, give following results with four chemical tests.
`|{:(,"Bromine","Na metal","Chromic acid","Lucas reagent"),("Compound X","decolourises","bubbles","Orange to Green","No reaction"),("Compound Y","No reaction","No reaction","No reaction","No reaction"):}|`
Compound X and Y respectively are :