The word equations for two reactions of ethene are given below. Reaction 1: ethene + hydrogen $\rightarrow$ ethane. Reaction 2: ethene + bromine $\rightarrow$ 1,2-dibromoethane. The bond energies for the bonds used in the reactions are listed in the table. What is the value of $(\Delta H_{\text{reaction 1}} - \Delta H_{\text{reaction 2}})$?
- A$+240\,\text{kJ mol}^{-1}$
- B$+3\,\text{kJ mol}^{-1}$
- C$-3\,\text{kJ mol}^{-1}$
- D$-246\,\text{kJ mol}^{-1}$