The neutral complex Mo2(NMe2)6 has only terminal Mo-NMe2 bonds and Mo2(NMe2)6 is structurally connected to Cr2(O2CMe)4(H2O)2. Draw a molecular frontier orbital scheme for Mo2(NMe2)6 starting from Mo(NMe2)3 fragments. Do not forget to label the d orbitals and the resulting molecular orbitals. What is the bond order between the two molybdenum centres in this complex?

NiCl4]2- and Ni(CO)4 have sp3 or dsp2 hybridization? Explain. What type of hybridization is shown by (i) inner and (ii) outer orbital octahedral complexes?

Consider IF3O2 (with I as the central atom). How many isomers are possible (draw them)?Which is likely to be the most stable isomer AND why? Assign the point group designation to each isomer.

Chemistry Draw the new Molecular orbital energy diagram for [Co(NH3)5(H2O)]3+, indicating the symmetry designations for the orbitals. You have to go through the reducible representation process

anic chemistry II 4) Which of the following compounds can exhibit fac-mer isomerism? a) [Ir(NH3)4Br₂]* b) [Ru(CO),ONO]²+ II: [Pt(dien)CI]* c) [Mo(CO), (NH3)3] ³+ 5) What is the symmetry point group for (cis-NiF₂Br₂²) (b) C₂v (a) D₂h (c) C₂h 6) Which of the following complexes are chiral? I: [Ru(en)3]² III: a) Only III 7) Which of the following will give a white precipitate upon reacting with AgNO3? c) [Cr(H₂O),]Cl; b) [Ir(NH3)3Cl3] a) K₂[Ni(en)₂Cl₂] b) II and IV (d) Dah cis-[Cr(C₂O4)₂Cl₂]³- c) I and III d) [Ag(CO),F]* (e) Cs IV: trans-[Cr(C₂O4)2Cl₂]³¹ d) II and III d) [Fe(H₂O),Cl3]

6. Below (top of next page) are shown two possible configurations for a metal center with six cyanide (CN): a trigonal prism (A) and the trigonal anti-prism (B). a. Assign the point groups for A and B assuming the M-C bond distances are the same and that the C-N bond distances are the same. Also, all C-M-C bond angles for nearest neighbor cyanide ligands are 90°. b. Determine the irreducible representations for the C-N stretching vibrations in A and B (you will first need to find the reducible for these modes and then reduce that representation). c. d. Identify the number of IR and Raman active modes for A and B. State and explain whether one can distinguish between the two possible geometries using only IR spectroscopy. N=3 XX N A B

2.Why does   K4[NiBr6]  behave as a simple Curie paramagnet , but K2 [NiBr4] exhibit complex paramagnetic behavior with a temperature dependent effective magnetic moment .

Which would have a higher CO stretching frequency, Cr(CO)6 or V(CO)6–? Explain why in detail using molecular orbital arguments.

8. (a) Define chrömophore. Classify according to the type of electronic transitions, giving examples. the chromophores

About the special type of hybridization involved in complexation (all are correct except Select one: 1- in case of d2sp3 hybridization trigonal (square planner) shape complex is obtained while in case of dsp2 hybridization a hexagonal shape complex is obtained 2- dsp2  hybridization is obtained when the transient metal orbitals d orbitals , one S and 2 p orbitals are mixed together to obtain six equivalent d2sp3 orbitals forming a hexagonal shape complex 3- in case of six guests containing complex like ormaplatine d2sp3 hybridization is encountered while in case of cisplatin dsp2 hybridization is encountered 4- d2sp3 hybridization is obtained when the transient metal orbitals 2 d orbitals , one S and 3 p orbitals are mixed together to obtain six equivalent d2sp3 orbitals forming a hexagonal shape complex