Aldehydes, Ketones and Carboxylic Acids Part 3

An organic compound (X) with molecular formula C3H6O is not readily oxidised. On reduction it gives C3H8O(Y) which reacts with HBr to give a bromide (Z) which is converted to Grignard reagent. This Grignard reagent on reaction with (X) followed by hydrolysis give 2, 3-dimethylbutan-2-ol. Compounds (X),(Y) and (Z) respectively are