On dropping a small piece of sodium in a test-tube containing carbon compound ' $X$ ' with molecular formula $\mathrm{C}_2\mathrm{H}_6\mathrm{O}$, a brisk effervescence is observed and a gas ' $Y$ ' is produced. On bringing a burning splinter at the mouth of the test-tube the gas evolved burns with a pop sound. Identify ' $X$ ' and ' $Y$ '. Also write the chemical equation for the reaction. Write the name and structure of the product formed, when you heat ' $X$ ' with excess conc. sulphuric acid.