Aldehyde And Ketone

A Carbonyl compound \(\mathrm{X}\) when reacted with Methyl magnesium bromide followed by hydrolysis gave product \(\mathrm{Y}\). When \(\mathrm{Y}\) is heated with \(\mathrm{Cu}\) at \(573 \mathrm{~K}\), it gave \(\mathrm{Z}\) (2- Methylbut-2-ene) as one of the products. Identify \(\mathrm{X}\).