IIIIIIII IIIII IIIII IIIII IIIII IIIIII I

SI.No.

0004

IX Semester

Total No. ofcPages: 3

c. M.Sc.

Ed. Examination,

May/June

201§ "'

",1 CHEMISTRY (Scheme: CBCS) Concepts, Models and Structural Methods in Inorganic Chemistry Time:

2 Hours

]nstructions

Ql) a)

b)

00 Answer

Max. Marks : 50 all the questions following

the internal

choices.

Draw possible structures, identify the correct structure and predict the expected bond angles in XeF 4 and SF4. [5] Draw MO energy level diagram NO 2-Identify FMOs. OR

Q2) a)

b)

Consti-uct MO energy level diagram for HF 2- and write the electronic configuration of the anion. " [5] Predict the shapes and bond angles in XeOF 4and CC12( carbene ion). [3]

c)

Q3) a)

b)

The spectraoflanthanide complexes generally show much narrower and more distinct absorption bandsthan those of transition metal complexes. Elaborate the statement. [3] What are the types of clusters? Predict the structure of the following clusters and write the structures. .[5] i)

ii)

c)

Write the reactions ofuranium tetra chloride.

[2]

P. 7:0.

OR Q4) a)

b)

What are isolobal species? How will you apply isolobal concept to predict the structures of clusters? Predict the structure of following compounds. [6] i) ii)

[4]

Q5) .a) b)

BoY" doe's hyperfine coupling occur in EPR experiment? Sketch the EPR

spectrum

of

naphthalene

anion

radical.

.

[6]

OR Q6) a)

b)

Taking an example, show how, a reaction can be followed using the 31p NMR spectroscopy.

[4]

Predict the number of peaks and their multiplicities 19p{H} -NMR

in the 31P{~} and

and proton coupled NMR spectra of the following

compounds.

[6]

F H3C

p/

ii)

i)

~

-2-

Q7) a)

Account follo\\ing is a strongerfor pi th,e -acid. ' trends and predict which phosphine ligand[5] -

VCO cm-1

Complex

2090,2055 2040.1991 1977,1888 1934,1835 --1915,1783

1898,1758 1888,1746

b)

Taking 57Feas an example, illustrate how reco'iling and hyperfine splitting occur in Mossbauer experiment. [5] OR

Q8)

a)

b)

The UV-photoelectron spectra ofN2 has three peaks and that of 02 has four~ peaks. Interpret the spectra. In addition, account for the fine structures of the spectra. .[5] Discuss the following: i)

isomershift in Mossbauer spectroscopy.

ii)

Fragmentation in Mass spectrometry.

Q9) Answer any ~of

I

[5]

, ~-,-

the following:

[2 X 5 = 10]

a)

How does ENDOR spectrum arise? Sho~ energy levels arising in ENDOR for a radical having single nucleus with [= 1/2. Sketch expected ENDOR spectrum of 9,1 0 -dimethyl anthracene cationic radical.

b)

Describe Magnetic anisotropy in benzene and ethylene.

c)

i)

.NH3, NF 3 and NI3-all have trigonal pyramidal structures. Arrange them in increasing order ofbond angles and account for your answer.

ii)

The 19F NMR spectra of PF 5 shows only one doublet when observed upto -130 K3. Below this temperature many lines are obtained. Account for the observation.

d)

Discuss Augur electron spectroscopy and its applications.