Consider the following ideal geometries for MXn molecules (n=3-6) and the distortions described for each. What are the point groups of the ideal geometry and the distorted geometry? a. MX6 octahedral distorted by elongating two trans-related bonds. b. MX6 octahedral distorted by slightly closing the 90 angles between the three M-X bonds in both sets of cis-related positions.

Solid CrF3 contains a Cr(III) ion surrounded by six F- ions in an octahedral geometry, all at distances of 190 pm. However, MnF3 is in a distorted geometry with Mn-F distances of 179, 191, and 209 pm (two of each). Suggest an explanation.

Predict the electron-pair geometry and the molecular geometry ofsulfur dioxide, XeF4.

a. The electron-pair geometry is tetrahedral, the moleculargeometry is tetrahedral.
b. The electron-pair geometry is octahedral, the molecular geometryis tetrahedral.
c. The electron-pair geometry is tetrahedral, the moleculargeometry is octahedral.
d. The electron-pair geometry is octahedral, the molecular geometryis square-planar.
e. The electron-pair geometry is square-planar, the moleculargeometry is tetrahedral

2) What is an polydentate ligand? Draw the structure of two examples and include the molecular formula. Describe the chelate effect including how it lowers the overall energy of a comples. Give the IUPAC name for each of the ligands that you listed 3) What is the spectrochemical series? Explain why cyano or phosphine ligands are placed high in the spectrochemical series but the hydroxide ligand or the halo ligands are quite low in the spectrochemical series? 4) what are the possible geometries for the six coordinate nickel (II) complexes in this experiment? Draw simple d-orbital ligand field energy diagrams to show the possibilities. Once you have completed this experiment you should be in a position to postulate which of thiese complexes should be the most distorted fom the ideal octahedral geometry.