Apply the 18-electron rule to predict the compounds that are likely to be formed by the following combinations of metals and ligands. Mononuclear (one metal center), neutral comounds only are required.
a) n5-Cp, CO, V
b) H, PF3, Fe
c) 1,3,5-cycloheptatriene, n5-Cp, Mn
d) allyl, CO, Co
e) 1,3-butadiene, CO, Fe