Download How molecular orbital theory of metal ligand bonding in complexes

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MSc(Chemistry) Semester II
MSCH211 – COORDINATION CHEMISTRY
MODEL QUESTION PAPER
Time: 3 Hrs
Note:
1. All questions are compulsory in section A. The answers of these questions
are limited upto 30 words each. Each question carries 2 marks.
2. Attempt FIVE questions in all from Section B, selecting ONE question
either A of B from each question. Answer of each question shall be limited
upto 250 words. Each question carries 6 marks.
3. Attempt 3 questions in all from section C. Answer of each question shall be
limited upto 500 words. Each question carries 10 marks.
SECTION A
1. a How molecular orbital theory of metal ligand bonding
. complexes differs from the crystal field theory?
in
b What do understand by π acceptor ligands?
.
c What is trans effect? Explain with suitable example.
.
d The transfer of electron from [Cr(H2O)6]2+ to
3+
.
[Co(NH
3)6] in aqueous medium is slower than the
transfer from [Cr(H2O)6]2+ to [Co(NH3)5(OH)]2+ explain
why?
e Explain linkage isomerism using suitable example.
.
f. Explain why do square planar complexes do not exhibit
optical isomerism?
g Draw orgel diagram for the d2 ion in octahedral as well
. as tetrahedral ligand field.
h Detemine ground state term for Si and Cr3+?
.
i. What do understand by the plane polarised light?
j. Explain the term ORD.
SECTION B
2. A Electrostatic approach doesn’t correctly explain the
.
sequence
of ligands in the spectrochemical series. How
do these anomalies can be explained using molecular
orbital approach?
OR
B Explain the bonding in tetrahedral complex using
. molecular orbital theory.
3. A Explain the conjugate base mechanism (SN1CB) & give
. evidences in support of this mechanism.
OR
B What do you mean by transition state theory of ligand
.
substitution
reaction? How does following factors
affect nature of mechanism for acid hydrolysis
reaction?
a) Charge on the substrate
b) Inductive effect of ligands
4. A Explain geometrical isomerism in complexes with
. coordination number 4 and 6.
OR
B Write a short note on racemisation reaction.
.
5. A Using vector notations calculate ground state term for
. the metal ion with d2 configuration?
OR
B What are Tanabe-Sugano diagrams? How these
.
diagrams
are different from orgel and correlation
diagrams?
6. A What do understand by charge transfer spectra? Why
.
does
compounds showing such spectra are intesly
coloured?
OR
B Write short notes on
.
a. Spin crossover.
(3+3)
b. Anamolous magnetic moments in solution
due to solute-solvent interactions.
7.
8.
9.
10.
11.
SECTION C
Discuss π bonding in octahedral complexes on the basis
of MOT.
Discuss with example the lability and inertness of
octahedral complexes according to VBT and CFT.
What are electron transfer reactions? Explain the
mechanism of one electron transfer reaction with
suitable examples.
What do understand by correlation diagram? Why
correlation digrams are better than Orgel diagrams?
Derive the correlation diagram of d2 ions considering
only the highest multiplicity states.
What are charge transfer transitions? How they explain
the colour of various pigments on the basis of ligand to
metal charge transfer transition?