Crotonaldehyde, $\text{CH}_3\text{CH}={CHCHO}$, may be prepared by oxidising butadiene, $\text{CH}_2=\text{CHCH}=\text{CH}_2$, with air or oxygen. In one process, a blend of butadiene and oxygen is passed through a hot aqueous solution of palladium(II) ions, $\text{Pd}^{2+}(aq)$, which act as the catalyst for the reaction. Which statement is not correct about the role of the $\text{Pd}^{2+}(aq)$ ions?
- AChanging the concentration of the $\text{Pd}^{2+}(aq)$ will have an effect on the rate of the reaction.
- B$\text{Pd}^{2+}(aq)$ increases the energy of the reacting molecules.
- C$\text{Pd}^{2+}(aq)$ lowers the activation energy for the reaction.
- D$\text{Pd}^{2+}(aq)$ provides a different route for the reaction.