An ester (X) with molecular formula `C_9 H_(10) O_2` was treated with excess of `CH_3 Mg Br` and the complex so formed, was treated with `H_2 SO_4` to give an alkene (Y) whose ozonolysis gave a ketone with molecular formula `C_8 H_8 O` which shows positive iodoform test. The structure of (X) is