2. Answer ALL parts A schematic catalytic cycle is shown below, based on rhodium phosphine complexes, with the ligand donor atoms denoted by P (=phosphine), and X and Y as other ligands. The local point symmetry at Rh is also given. The cycle is monitored by solution phase Raman spectroscopy. Rh Y 1. 1 Czy X-Rh X 2 cs P I X-Rh! Y-R P Y 4 D3n 3 C1 (a) USE THE METHOD OF UNSHIFTED BONDS to deduce the symmetries of Rh-P stretching modes in compounds 1 to 4. (14 marks) (b) Determine which compounds 1 to 4 can be identified uniquely from the form of their Raman spectra. (6 marks) (c) For those compounds that have the same form of Raman spectra, explain whether their infrared spectra could allow them to be uniquely identified. je