Name the enzymes and write the reactions involved in the preparation of ethanol from sucrose by fermentation.

Sucrose is converted to glucose and fructose in the presence of an enzyme, invertase or sucrase. Glucose and fructose undergo fermentation in the presence of another enzyme, zymase. Both these enzymes are present in yeast.

C12H22O11+H2OInvertase/sucrose C6H12O6+C6H12O6
  Sucrose                                    Glucose     fructose
        

                  C6H12O6 Zymase2CH3CH2OH +2CO2
Glucose/Fructose           Ethanol