Question

In alcoholic fermentation, CO${}_2$ is evolved during

• A. Decarboxylation of pyruvic acid
• B. Formation of acetaldehyde
• C. Oxidation of acetaldehyde
• D. Both A and B

Answer 1

Answer: (D)

Both A and B

Fermentation is a type of anaerobic respiration in which the glucose is converted to release gases, acids and alcohols.

During the alcoholic fermentation of glucose, glycolysis takes place as a result of which pyruvic acid is formed. Pyruvic acid is a three-carbon molecule.

It is then converted into acetaldehyde by losing one carbon dioxide molecule as decarboxylation of pyruvic acid takes place and it forms to 2C acetaldehyde.

So, the correct option is 'Both A and B'