The end product of one stage fermentation is
i. Alcohol is manufactured by fermentation of sugars
C6H12O6 - → 2CO2 + 2C2 H5 OH
(sugar) (in yeast) (Alcohol)
ii. Fermentation proceeds till alcohol content reaches 15%; Alcohol itself inhibits the reaction
a. The major source of commercial alcohol is Molasses, a byproduct of sugar industry.