Final answer:
In organic fuel molecules, bonds are broken during chemical reactions such as combustion, releasing energy as new bonds form with oxygen, producing substances like carbon dioxide and water.
Step-by-step explanation:
When organic fuel molecules undergo combustion or a similar chemical reaction, the bonds within these molecules are broken. This is because it takes energy to pull apart bonded atoms, and this energy is provided by the reaction process itself. When a fuel burns, for instance, carbon-hydrogen bonds and other organic bonds in the fuel break and new bonds form as the elements combine with oxygen from the air, forming carbon dioxide and water. The energy released during this process usually comes in the form of heat and sometimes light.
As per the question, if one of the C-H bonds in an organic compound breaks, this may lead to the formation of different products depending on the other reactions involved. In a combustion reaction, the breaking of bonds in organic molecules is followed by the formation of new and typically simpler molecules.
The strength of covalent bonds and the energy required to break them is a key concept in understanding these processes. Stronger bonds require more energy to break, but once these bonds are broken, and new bonds are formed, energy is released, thus driving the reaction forward.