Question

How is ethanol produced by fermentation?

• A. Using anaerobic conditions at ${30}^{\circ }C$
• B. Using anaerobic conditions at ${450}^{\circ }C$
• C. Using steam at ${30}^{\circ }C$
• D. Using steam at ${450}^{\circ }C$

Answer 1

The correct option is A Using anaerobic conditions at ${30}^{\circ }C$

$glucose\stackrel{yeast}{\to }ethanol+carbondioxide$

$C_6{H}_{12}{O}_{6\left(aq\right)}\stackrel{yeast}{\to }2C_2{H}_{5}O{H}_{\left(aq\right)}+2C{O}_{2\left(aq\right)}$

A chemical reaction called fermentation takes place in which the glucose is broken down to ethanol by the action of enzymes in the yeast.

The temperature must be between the range of 25°C and 50°C. Enzymes are affected a great deal by temperature. If the temperature is too cold the enzymes move around too slowly to meet the substrate and for a reaction to occur.

Option A is correct.