Which chemical equation represents a possible chemical reaction? A. H2O2 -> H2O + O2 B. 6CO2 + H2O + energy -> C6H12O6 + 602 C. C2H4O2 ->...

None of the given equations are balanced. However, if we were to assume that balancing is not an issue, we can select the possible chemical reactions.

A: Hydrogen peroxide breaking down to water and oxygen. This reaction is possible and the balanced chemical reaction for the same is:

`2H_2O_2 -> 2H_2O + O_2`

B. This is the reaction of photosynthesis (assuming the energy is the Sun's energy or sunlight). The balanced chemical equation for the same is:

`6CO_2 + 6H_2O + sunlight -> C_6H_12O_6 + 6O_2`

In this reaction, carbon dioxide and water react, in presence of solar energy, and generate glucose and oxygen. 

C. The reaction does not have sodium on the reactant side and there is sodium on the products side of the reaction. This cannot be the case (sodium has to be present on both sides of reaction). Thus, this is not a possible chemical reaction.

Hence A and B are the only options that represent a possible chemical reaction.

Hope this helps.