Transition Metal Clusters: Introduction and Applications — DU B.Sc (hons) Chemistry Previous Year Question Papers

Name of 'the Paper DSE: Transition Metal Cluster - Introduction and B.Sc. (Hons.) Chemistry 1. (a) Determine x assuining 18-electron rule is obeyed: (b) Name and explain with examples, the three types of bonding present in metal clusters. (c) Write the points of differences between metal - 1igand complex and heteronuclear cluster. (6,6,3) 2. (a) (b) (c) Draw the structures of the following transition metal clusters : Explain the bonding in eclipsed and staggered forms of [Re2Cl8]2- cluster ion. What are low nuclearity metal clusters? Give the characteristics of metal and ligands, which form such clusters, conveniently. (6,6,3) 3. (a) Calculatethe total number ofM-Mbonds andnumberM-M bondsper metal in the following transition metal clusters : (b) What is the meaning of a- and Li-complexes of metal-borane and metalcarborane? (c) How is the ;bility to bridge CO ligands varies down the group for transition metals? Explain giving examples? (6,6,3) (a) Determine the structure of the following Transition Metal Clusters using Wade's Rule : (b) Write the steps involved in hydrogenation of alkenes using [Hlr4(CO)]]] as catalyst. (c) Complete the following reactions : ` (a) Give example/s of boranes or carboranes [p-block clusters], which are analogous to : (b) Give an example each of tetranuclear tungsten cluster and hexanuclear molybdenum cluster. Draw the.ir structures also. (C) State Whether Co6(CO)[5, [Fe6(CO)]8]2-and [86H6]2- isolobal in nature. 6. Write short notes on any three of the following : (a) Chevrel clusters (b) Zintl clusters (c) Water gas shift reaction (d) Molecular orbital Diagram of co (5,5,5)