LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

AD 20

THIRD SEMESTER – NOV 2006

CH 3802 – COORDINATION CHEMISTRY

 

 

Date & Time : 27-10-2006/9.00-12.00   Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

 

Answer the following:                                                                                    (10 x 2 = 20 marks)

 

1. Draw the structure of optically inactive isomer of the following, giving reasons for optical inactivity [Co (ox)₂ Cl₂]^-3 ion (ox = oxalato).
2. Give the IUPAC names of (i) ferrocene (ii) nickeltetracarbonyl.
3. What are the defects of VBT?
4. Mention the assumption used by crystal field theory?
5. What is nephelauxetic effect?
6. What is CRSE?  Calculate CFSE of a d⁸ metal ion containing coordination compound.
7. What are complimentary and non-complimentary electron transfer reactions?
8. What are thermodynamically stable and kinetically stable coordination compounds?
9. Explain 18 electron rule with an example.
10. Give structures of any two industrially useful coordination compounds.

 

PART – B

 

Answer any EIGHT of the following                                                            (8 x 5 = 40 marks)

 

1. What is chelate effect?  Give thermodynamic explanation for this effect.
2. Why does electronic spectrum of [Ti (H₂O)₆]³⁺ show a shoulder, though Ti³⁺ is a d’ system?
3. Why is [Cu(en)₃]²⁺ less stable than [Cu(en)₂ Cl₂]⁺?
4. Explain the theoretical basis of trans effect.
5. How is esr spectrum useful in proving covalency in M-L bond?
6. Explain Job’s method of continuous variation?  What is inferred from this experiment?
7. Draw and explain various types of overlap of orbitals of central atom/ion and ligand to from a p bond in an octahedral molecule.
8. How is Mossbauer spectroscopy useful in deducing geometry of Fe₃(CO)₁₂?
9. Discuss bonding nature of p – electron delocalized ligands with central atom/ion.
10. What is the central metal atom present in Vitamin B₁₂?  What is its oxidation state?  What is the use of this vitamin?
11. Give an account of orgamometallic compounds.
12. Explain any two uses of coordination compounds in laboratories.

 

PART – C

 

Answer any FOUR of the following                                                                         (4 x 10 = 40 marks)

 

1. What are the factors affecting CFSP of coordination compound?  Explain each factor.
2. Draw energy level diagram and explain the formation of a square planar molecule according to CFT.
3. What are the differences between Tanabe-Sugano diagram and Orgel diagram?
4. Discuss S_N1, S_N2 and S_N CB mechanisms of an octahedral coordination compound.
5. List and explain various photochemical and photo physical processes of coordination compounds.
6. Write short notes on (i) Marcus – Hush Theory       (ii) Oxygen transport.                 (5+5)

 

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