J. Franckaerts and G. F. Froment [Chem. Eng. Sci., 19 (1964) 807] investigated the reaction listed in Exercise 3 over the same temperature range using a CuO/CoO/Cr2O3 catalyst. The rate expression obtained in this work was of the form: r=[1+KEtPEt+KAdPAd+KDHPDH]2k[PEt(PAdPDH)/Ke] Write a reaction sequence that gives a rate expression of this form. What is different from the sequence used in Exercise 3