Which substances are products of a fermentation reaction?

1. water and carbon dioxide

2. alcohol and carbon dioxide

3. soap and glycerol

4. ester and water

2. alcohol and carbon dioxide

Explanation:

Fermentation is a metabolic process which is used to produce chemical changes in various organic substances. This process is used in many fields including biochemistry, where it is defined as the "extraction of energy from carbohydrates in the absence of oxygen". The main substances produced from fermentation reaction are alcohol, carbon dioxide and lactic acid.