Coordination Chemistry and its Application in Biological Systems (DSC-13, Chemistry-05) — DU B. Sc. Life Science (Chemistry) Previous Year Question Papers

1. (a) Write IUPAC name of the following complexes: (b) Explain the following in details : (i) Strong and Weak Jahn-Teller distortion (i) Tetrahedral complexes are high spin (c) Draw all possible isomers of 1C(C,O,)(1,0),l: Which of these isomers will he optically active and why? (5,5,5) (1) Calculate the number of unpaired electrons (1) and CFSE value in terms of CFS and P for the following complex : (b) On the basis of Valence Bond theory answer the following questions for a six- coordinated complex ion [Co (NO,)61- (i) What is the oxidation state of Cobalt? (ii) What type of hybridization is involved? (iii) What will be no. of unpaired electron(s)? (iv) What is the magnetic behavior of the complex ion? (v) Whether the given complex is inner orbital or outer orbital complex? (c) Write the chemical formula for the following complexes : (i) Ammonium aquapentafluoronickelate(IV) (iii) Sodium pentacyanonitrosonium ferrate(1) (v) HexaamminecobaltIII) chloride (5,5,5) 3. (a) What are the differences between hemoglobin and myoglobin? (b) Explain what is meant by dorms stepwise formation constant Kn and overall formation constant Br of a coordination complex. How are these two constants related? (c) What are the limitations of valence bond theory? (5,5,5) (i) What is the chelate effect? Why does [Co(en), 3" have a higher value of stability constant than [Co(NH,) P+? (i) Show how the d-orbital splitting changes as an octahedral complex undergoes tetragonal distortion and eventually becomes a square planar complex. (b) Give the mechanism of carbonic anhydrase enzyme where it converts CO, to HCO, - (c) Write a short note on (any two) : (i) Trans effect (i) Spectro-chemical series and its importance (iii) Co-operative effect in hemoglobin (5,5,5) 5. (a) Crystal field splitting energy for [Cr(NH,).1'+ is 10.200 cm', while for [C(NH,) 12+ is 5,900 cm l. Give reasons. (b) Explain [NiC1,12 is tetrahedral and paramagnetic but [Ni(ON),1' ion is square planar and diamagnetic. (c) (i) What is central active metal ion in carboxypeptidase enzyme? What is its coordination number? (i) Explain the function of carboxypeptidase enzyme. (5,5,5) 6. (a) Discuss the mechanism of substitution rcactions in square planar complexes. (b) State and explain the factors that affect the stability of complex ions. (i) Structure and function of Myoglobin (ii) Oxygen binding curve for myoglobin (5,5,5)