LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

GH 39

M.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – APRIL 2008

    CH 3809 – COORDINATION CHEMISTRY

 

 

 

Date : 29/04/2008            Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

Answer all the questions                                                            (10 ´ 2 = 20)

 

1. Why do octahedral complexes undergo substitution of ligands by S_N1mechanism?
2. What are the merits and demerits of CFT?
3. Define CFSE. Calculate CFSE for d⁷ , low spin and high spin octahedral system.
4. What is spectrochemical series? Mention any two applications.
5. Derive the ground term configuration of d³?
6. Why Mn(II), d⁵ metal complexes are colourless?
7. Mention two biologically important coordination compounds and their applications.
8. Find the values of x and y assuming the validity of the 18 electron rule for [Mn(CO)_x(NO)_y].
9. Why is the rate of electron transfer reaction slow in the system [Co(NH₃)₆]²⁺/³⁺ compared to [Fe(CN)₆]^3-/^4- system?
10. What is Wilkinson catalyst? What type of chemical reaction can be effected by using this catalyst?

 

PART – B

Answer any EIGHT questions                                                      (8 ´ 5 = 40)

 

1. Calculate OSSE and state whether the following oxides are spinel or inverse spinel : Mn₃O₄, Fe₃O₄, CuFe₂O₄.
2. Differentiate labile and inert complexes using crystal field theory.
3. Discuss any two evidences of crystal field theory’
4. What is linkage isomerism? How are these isomers differentiated by IR spectral analysis?
5. Write short notes on Nephelauxetic effect.
6. State and explain Jahn-Teller effect.
7. Why do electronic spectra of [V(H₂O)₆]3⁺ show only two absorption bands against three predicted for the system?
8. What is trans effect? Explain the theories of trans effect in explaining the mechanism of substitution reaction of square planar complexes.
9. Discuss the expected Esr spectrum of  [Cu(salicylaldimine)₂]²⁺ ion.
10. What are supramolecules? Explain the nature and types of interactions of supramolecule.
11. Discuss the structure and functions of the enzyme, carboxypeptidases.
12. Explain the types of photochemical reactions with examples.

PART C

Answer any FOUR questions                                                (4 x 10 = 40)

 

1. How do the d-orbitals split in square planar and tetrahedral crystal field of ligands?
2. Explain with the help of MO theory why Cl^– acts as a weak ligand where as CN^– acts as a strong ligand in octahedral transition metal complexes.
3. Draw and explain the Orgel diagram for d², d⁷ octahedral and d⁸, d³ tetrahedral configuration of metal ion and explain the possible electronic transitions.
4. Explain the mechanism and factors affecting the innersphere and outersphere electron transfer reaction of metal complexes.
5. Write notes on i) the Wackers process ii) hydroformylation reaction
   iii) metathesis reaction.

28. Explain the structural aspects of haemoglobin in the oxygen transport.

 

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