JEE Main 2018 Chemistry question on Some Basic Concepts of Chemistry

The ratio of mass per cent of C and H of an organic compound $(C_xH_yO_z)$ is 6 : 1. If one molecule of the above compound $(C_xH_yO_z)$ contains half as much oxygen as required to burn one molecule of compound $C_xH_y$ completely to $CO_2$ and $H_2O$. The empirical formula of compound $C_xH_yO_z$ is