Nalanda Open University 2010 M.Sc Chemistry Part–I, –VII (Reaction Mechanism and Supramolecular ) - Question Paper

M.Sc. Chemistry Part–I, Paper–VII (Reaction Mechanism and Supramolecular Chemistry)
Annual Examination, 2010

IN ALAIN DA OPEN UNIVERSITY M.Sc. Chemistry

Part-1, Paper-VIl (Reaction Mechanism and Supramolecular Chemistry)

Annual Examination, 2010 Full Marks : 80    l ime : 3 Hours.

Answer tint/ IIVL Questions. All tjuestious earn/ a jit til murks.

1.    (a) Enumerate applications of metal acetvlocetonate complexes.

(I)) Draw the structure of monomeric Fe(acac)_f and trimeric [M(a<*ac)₂],.

2.    (a) Describe the photo oxidation and photo reduction process.

(I)) What are the applications of photochemical reactions of complex compounds ?

3.    (a) Discuss Marcus-I Iusch theon- for the electron transfer reaction via cross reaction. (I)) Give the corresponding exchange reactions for outer sphere reduction of

[Q    by [Cwt/Vr/j.v),]".

4.    (a) Explain supramolecular chemistrv is the chemistrv hevond the molecule.

(I)) Describe in short, non-covalent interactions in supramolecular chemistn- with appropriate examples.

5.    Discuss all possible pathways of racemization of optical isomers of octahedral complexes with suitable examples.

6.    Draw structures of mononuclear Schiffs base complex of Ruthenium and binudear Schiffs Iwse complex of cohalt. F.xplain the structure.

7.    (a) Draw the energv level diagram of Cr(III) complexes in octahedral state.

(b)    Explain the phenomenon of phosphorescence ami fluorescence.

8.    (a) Discuss the electron transfer reaction bv inner sphere mechanism. Give examples. (I)) Explain electron transfer reactions in the following reactions.

[c'o¹¹¹ (NH _?)₅ r/f + [Cr*    - [c'o^tt {NH ,)₅ {H₂0)f + [cr^m {H₂0),ctj*

9.    Discuss the mechanism of inversion of optical isomers of octahedral cobalt (III) complex ion by

(a) Bailar twist (Trigonal tw'ist)/Rav-Dutt twist (Tetragonal twist) mechanism.

(I)) Dissociative/Associative mechanism.

10. Enumerate the concepts in Supramolecular chemistrv. Explain anv three of these concepts.

Or,

Write explanaton- notes on anv Three of the following (a) Complimentan- and Non-Complimentarv reactions.

(I)) Intermodular rearrangements.

(c)    Excited Electron Transfer.

(d)    Neutral guest binding.

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Attachment: nalanda-open-university-2010-m-sc-chemistry-40601-1.gif

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