In the fermentation of sugar to ethanol, the enzyme that converts glucose into ethanol and carbon dioxide is

Invertase hydrolyses cane sugar to glucose and fructose, and zymase (from yeast) converts glucose and fructose to $\mathrm{C}{}_2\mathrm{H}{}_5\mathrm{OH}$ and $\mathrm{CO}{}_2$. Diastase converts starch to maltose and maltase converts maltose to glucose.