A rhodium metal centre undergoes cyclometallation with two units of C=C, what is the expected product of this reaction? O A. 5-membered rhodacycle ring is formed O B. 6-membered rhodacycle ring is formed O C. the two units of C=C are reduced to alkane C-C bond. O D. the two units of C=C are inserted to the rhodium metal centre

The transition metals form a class of compounds called metal carbonyls, an example of which is the tetrahedral complex Ni(CO)4. Given the following thermodynamic data (at 298 K): (a) Calculate the equilibrium constant for the formation of Ni(CO)4(g) from nickel metal and CO gas. (b) Is the reaction of Ni(s) and CO(g) product- or reactant-favored at equilibrium? (c) Is the reaction more or less product-favored at higher temperatures? How could this reaction be used in the purification of nickel metal?

Is it possible for a complex of a metal in the transition series to have six unpaired electrons? Explain.

How many geometric isomers of the complex ion [Cr(dmen)3]3+ can exist? (dmen is the bidentate ligand 1,1-dimethylethylenediamine.) 1,1-Dimethylethylenediamine, dmen

Chelating ligands often form more stable complex ions than the corresponding monodentate ligands with the same donor atoms. For example, Ni2+(aq)+6NH3(aq)Ni(NH3)62+(aq)K=3.2108Ni2+(aq)+3en(aq)Ni(en)32+(aq)K=1.61018Ni2+(aq)+penten(aq)Ni(penten)2+(aq)K=2.01019 where en is ethylenediamine and penten is This increased stability is called the chelate effect. Based on bond energies, would you expect the enthalpy changes for the above reactions to be very different? What is the order (from least favorable to most favorable) of the entropy changes for the above reactions? How do the values of the formation constants correlate with S? How can this be used to explain the chelate effect?

Trimethylphosphine, P(CH3)3, can act as a ligand by donating the lone pair of electrons on the phosphorus atom. If trimethylphosphine is added to a solution of nickel(Il) chloride in acetone, a blue compound that has a molecular mass of approximately 270 g and contains 21.5% Ni, 26.0% Cl, and 52.5% P(CH3)3 can be isolated. This blue compound does not have any isomeric forms. What are the geometry and molecular formula of the blue compound?

What is the coordination number of the central metal atom in the following complexes? (a) [Fe(H2O)63+] (b) [Pt(NH3)Br3] (c) [V(en)Cl42] (d) [Au(CN)2+]