M.Sc. (Semester III) (CBCS) Examination Nov/Dec-2018
Industrial Chemistry
INSTRUMENTAL ANALYSIS
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Figures to the right indicate full marks.
Q.1
Answer the following question:
14
Arrange their compounds in their increasing order of C=O stretching frequency
NHOINHOIINHOIII




What Crystalline material is used to make membrane for the detection fluoride in analyte solution?
Lanthanum fluoride
Praseodymium fluoride
Neodymium fluoride
All,
Which out of the following compounds, is expected to slow lower C=O stretching frequency?
OCH3O IOHOIINO2OIIINH2O IV
I
II
III
IV
ionic conductor is used to detect hydrocarbon gases
ZnO
MnO
TiO2
BaO
13C -1H shift correlation of nuclei is called as
HECTOR
NOESY
COSY
HMBC
Tagushi gas sensor is
SnO
Fe2O3
WO3
MnO
The 13C NMR spectrum of a compound contains two signals and in the 1H NMR spectrum there is a singlet. Which compound is consistent with these data?
Bromoethane
Acetone
Dichloromethane
Ethanol

In the IR spectrum of a compound there is a strong absorption at 1718 cm in addition to bands at 2978 and 2940 cm and bands below 1500 cm-1. The 1H NMR spectrum contains two signals: a quartet and a triplet with relative integrals of of the following compounds, which is most likely to be?
CH3CH2CO2H
CH3CH2OCH2CH3
CH3CH2OH
CH3CH2COCH2CH3
Which of the following statements regarding NMR spectroscopy is wrong?
NMR signals towards the left of the spectral chart correspond to larger chemical shifts.
Chemical shifts are larger when the frequencies of the radiation which induces the nuclear transitions are higher
Chemical shifts are larger when shielding effects are greater
A hydrogen signal splits into n+1 peak by spin -spin coupling when the number of equivalent hydrogen atoms on adjacent atoms is and no other neighbouring atoms are involved
10) Chemical shifts originate from
Magnetic momentum
Electron shielding
Free induction decay
Scalar coupling (J-coupling)
11) How many 13C NMR resonances are predicted for the 1-phenyl-1-propanol?
OH
9
8
7
6
12) What accounts for the blue color of the sky?
Interference
Scattering
Reflection
Refraction
13) What is the most characteristic feature of compounds containing one bromine atom in mass spectrum?
Gives a pair of peaks of equal intensity
Gives a pair of peaks of unequal intensity
Gives a single peak of double intensity
None of the above
14) Which of the following peak does not appear in the mass spectrum of hexane?
m/z=57
m/z=43
m/z=86
m/z=36
Q.2
a)Answer the following (any four)
08
How will you differentiate the following compounds by 13C NMR
What is Fermi resonance and overtone in IR Spectoscopy?
Why greater sensitivity is required to record 13C NMR spectra compared to that of PMR spectra?
Draw a neat labeled diagram of pH sensing glass membrane electrode
Draw Pascal's Triangle and give its significance
b)Write notes on (Any two)
06
Turbidimetery
Metastable ion
NMR Shift reagent
Q.3
a)Answer the following(Any two)
08
Explain Mclafferty fragmentation. Justify, which of the following compound show the Mclafferty Fragmentation?
Justify O-H stretching band at 3130 cm-1 of solid p-hydroxy acetophenone shifts to 3600 cm-1 in solution, whereas corresponding band of o-hydroxy acetophenone appearing at 3040 cm-1 remains unaffected, even after dilution
An organic compound of molecular formula C9H9OCl shows the followings features:
IR(KBr) a strong band at 1730cm-1
1HNMR 2.5δ 2H, 6.7-6.8δ 4.1δ 2H, Make proper assignment of the data.
b)Answer the following (any two)
06
Draw the Karplus Curve and explain its significance
An organic compounds of molecular formula C8H8O shows the following features:
IR 1720cm-1; 2985cm-1
1HNMR 6.5-6.8δ 2.4δ Predict the structure, and find out the various molecular fragments formed
Q.4
a)Answer the following (Any two)
10
Explain with example mechanism for first order spin-spin splitting in 1H NMR
Explain with example gas sensing membrane electrode
What is Ortho Effect? Find out the various fragments formed of the following molecule
OOHO+e
b)Answer the following (Any one)
04
Explain with suitable example DEPT experiment in NMR
Describe COSY experiment with example
Q.5
Answer the following (Any Two)
14
a)Discuss the classification of metal membrane electrode
b)Discuss in detail Time-of-Flight Mass Analyzer
c)An organic compound of molecular formula C9H10O2 shows the following features: IR(KBr) 1680cm-1
1HNMR 2.4δ 3.6δ 7.5δ 2H, J=7.5Hz); 7.0δ 2H, J=7.5Hz)
13C-NMR in δ 192, 163, 133, 125, 110, 51, 23 Make proper assignment of the data