Loyola College M.Sc. Chemistry April 2008 Coordination Chemistry Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

GH 56

 

THIRD SEMESTER – APRIL 2008

CH 3802/ 921 – COORDINATION CHEMISTRY

 

 

 

Date : 29-04-08                  Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

Part – A

Answer all the questions                                                                  (10 x 2 = 20)

 

  1. What are polydentate ligands? Give an example.
  2. What is the ground term of 3d7 configuration?
  3. Why the magnetic moment of Co(II) octahedral complexes are much higher than that of tetrahedral complexes?
  4. Explain why CrO42- ion with d0 configuration is coloured?
  5. What are Π-acceptor ligands? Give two examples.
  6. Explain SN1CB mechanism with an example.
  7. What is meant by hapticity of a ligand? How is it designated?
  8. Differentiate the types of cytochromes.
  9. What are cryptands? Mention any one application.
  10. What is Wilkinson catalyst? What type of reaction can make use of this catalyst?

 

Part – B

Answer any eight questions                                                      (8 x 5  = 40)

  1. What is tetragonal distortion? Which dn configurations lead to strong Jahn teller distortion in octahedral and tetrahedral complexes?
  2. What are the basic postulates of valence bond theory? How does valence bond theory explain the geometry and magnetic properties of (i) [Co(NH3)6]3+ and (ii) [CoF6]3-
  3. Explain how optical rotatory dispersion study is useful to determine the absolute configuration of chiral complexes.
  4. Discuss the bonding in ferrocene on the basis of molecular orbital energy level diagram.
  5. Explain the variations in the stretching frequency of the isoelectronic species, Cr(CO)6, V(CO)6and Mn(CO)6+.
  6. Explain the trans effect in the substitution reactions of square planar complexes.
  7. Explain the fluxional isomerism with two examples.
  8. Explain the crystal structures of Fe3O4, ZnFe2O4 as spinel or inverse spinel
  9. Explain the synergic effect of metal-ligand bonding in metal carbonyls.
  10. Apply Wade’s rule to predict the geometry of

a)[Fe5(CO)15C]         b) [h5C5H5RhFe3(CO)11]

  1. Briefly explain the significances of metal complexes in nitrogen fixation
  2. Write short notes on
  3. a) Wacker’s process b) Fischer Tropsch process

 

Part – C

Answer any four questions.                                                          (4 x 10 = 40)

  1. Explain the d orbital spilitting of square planar complexes using crystal field theory. Why does the metal ion with d8 configuration in a strong field form square planar complexes?
  2. Explain Why Cl acts as a weak ligand whereas CNacts as strong ligand in octahedral transition metal complexes with the help of MO theory.
  3. Explain the features of Tanabe- Sugano and Orgel diagram. Construct orgel diagram for d3and d7, tetrahedral and octahedral complexes.
  4. Explain the principles involved in the Mossbauer spectral analysis of metal complexes and explain how do the Mossbauer spectra of K4[Fe(CN)6] and K3[Fe(CN)6] differ.
  5. a) Discuss in detail the mechanisms of outer and inner sphere electron transfer in metal complexes.                                                                                  (10)
  6. b) Why is the electron transfer in the system [Co(NH3)6]2+ – [Co(NH3)6]3+ slower than that in the system [Fe(CN)6]4- and [Fe(CN)6]3- .                        .
  7. Describe the essential structure of haemoglobin and explain its cooperativity in its oxygenation.

 

Go To Main page