Question

(a) Name the gas evolved during fermentation process?
(b) What role is played by yeast in the conversion of cane sugar (C12H22O11) to
ethanol?
(c) How may the following be obtained from pure ethanol? Express chemical
reactions by the chemical equations.
(i) Sodium ethoxide (ii) Ethyl ethanoate (iii) Ethanal

Answer 1

a. metana
b. terlarut
c. difficult reaction

Answer 2

 (a) Carbon dioxide (CO₂) gas released during fermentation process.
           (b) During fermentation process yeast kills itself by converting the sugars (C₁₂H₂₂O₁₁) found in grapes to ethyl alcohol. Alcohol can be separated from this mixture of yeast and other formed products by distillation process.

Products  formed during  fermentationC₁₂H₂₂O₁₁ + H₂O + (invertase) → C₆H₁₂O₆ (glucose) + C₆H₁₂O₆ (fructose)
C₆H₁₂O₆ (glucose)  + Zymase →2 C₂HOH (ethyl alcohol) + 2CO₂