Answer:
See picture for answer
Explanation:
At the beggining, we know that X is a secondary alcohol, with 3 carbons. The only secondary alcohol with 3 carbons, it's the isopropylic alcohol (or 2-propanol). So, in strong acid conditions, we are actually dehidrating the alcohol, to form an alkene, and then it's oxidized to form either a Ketone or aldehyde.
So in picture 1, you have all three compounds, and the mechanism of reaction to form Y.