Exam Details
| Subject | Spectroscopy | |
| Paper | ||
| Exam / Course | Bachelor Degree Programme(Elective Course: Chemistry) | |
| Department | School of Sciences (SOS) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2015 | |
| City, State | new delhi, |
Question Paper
What do you understand by group vibrations and skeletal vibrations?
What are the essential requirements for a diatomic molecule to exhibit vibration-rotation spectrum What information can be derived from a vibration-rotation spectrum
The fundamental and first overtone transitions of 14N16O are centred at 1876·06 and 3724·20 respectively. Evaluate:
the equilibrium vibration frequency
anharrnonicity constant
zero-point energy
A compound having molecular formula C4H8O shows the following spectral data
Mass 72, 57, 43
IR 1716,2941-2857,1460
UV 274
NMR 1·0 (triplet, 2·47 (quartet, 2·20 (singlet, 3H)
Predict the structure of the compound and assign the peaks to the structural units of the molecule.
For a molecule AB2, the following spectroscopic data are available. Predict the geometry of the molecule:
Wave number IR Raman
519 Active (II)PQR Active (Polarised)
1151 Active (II)PQR Active (Polarised)
1361 Active (1)PQR Active (Depolarised)
State the symmetry elements present in the water molecule.
What is the effect of decrease in moment of inertia on the rotational energy levels
Why, for the ground state of He atom, having configuration 1s^2 is the triplet state not possible?
Sketch the rotational energy levels and the spacing between spectral lines for a rigid rotator and a non-rigid rotator.
Explain why TMS, (CH3)4Si, is used as one of the internal references in the measurement of chemical shifts of protons.
State and explain the Mutual Exclusion principle.
Describe the expected low resolution and high resolution PMR spectra of CH3CH20H.
What is the function of rotating mirror in Raman spectrometer?
Explain the principle of mass spectrometry.
The mass spectrum of chloroethane shows two peaks at m/z 64 and 66. The peak at m/z 66 is of one-third intensity as the peak at m/z 64. Which one is the molecular ion peak Account for the origin of the other peak.
Although the spectra of and are very similar, L M band in the first complex is at 36,000 while in the chloride complex is at 44,000 cm^-1. Suggest a reasonable explanation for this difference.
Explain the difference between intersystem crossing and internal conversion.
What is hyperfine splitting?
Phosphorescence is intense from solid samples. Why?
Acetone shows absorption maximum at 279 nm, in hexane solution, whereas in the aqueous solution, the absorption maximum is at 264·5 nm. Explain.
What are the factors on which the intensity of a spectral line depends?
Electronic transitions are called vertical transitions. Why
Obtain the molecular term symbols for the following three excited states of hydrogen molecule:
(ag (ag
(ag (ag
(ag (rru
What are the essential requirements for a diatomic molecule to exhibit vibration-rotation spectrum What information can be derived from a vibration-rotation spectrum
The fundamental and first overtone transitions of 14N16O are centred at 1876·06 and 3724·20 respectively. Evaluate:
the equilibrium vibration frequency
anharrnonicity constant
zero-point energy
A compound having molecular formula C4H8O shows the following spectral data
Mass 72, 57, 43
IR 1716,2941-2857,1460
UV 274
NMR 1·0 (triplet, 2·47 (quartet, 2·20 (singlet, 3H)
Predict the structure of the compound and assign the peaks to the structural units of the molecule.
For a molecule AB2, the following spectroscopic data are available. Predict the geometry of the molecule:
Wave number IR Raman
519 Active (II)PQR Active (Polarised)
1151 Active (II)PQR Active (Polarised)
1361 Active (1)PQR Active (Depolarised)
State the symmetry elements present in the water molecule.
What is the effect of decrease in moment of inertia on the rotational energy levels
Why, for the ground state of He atom, having configuration 1s^2 is the triplet state not possible?
Sketch the rotational energy levels and the spacing between spectral lines for a rigid rotator and a non-rigid rotator.
Explain why TMS, (CH3)4Si, is used as one of the internal references in the measurement of chemical shifts of protons.
State and explain the Mutual Exclusion principle.
Describe the expected low resolution and high resolution PMR spectra of CH3CH20H.
What is the function of rotating mirror in Raman spectrometer?
Explain the principle of mass spectrometry.
The mass spectrum of chloroethane shows two peaks at m/z 64 and 66. The peak at m/z 66 is of one-third intensity as the peak at m/z 64. Which one is the molecular ion peak Account for the origin of the other peak.
Although the spectra of and are very similar, L M band in the first complex is at 36,000 while in the chloride complex is at 44,000 cm^-1. Suggest a reasonable explanation for this difference.
Explain the difference between intersystem crossing and internal conversion.
What is hyperfine splitting?
Phosphorescence is intense from solid samples. Why?
Acetone shows absorption maximum at 279 nm, in hexane solution, whereas in the aqueous solution, the absorption maximum is at 264·5 nm. Explain.
What are the factors on which the intensity of a spectral line depends?
Electronic transitions are called vertical transitions. Why
Obtain the molecular term symbols for the following three excited states of hydrogen molecule:
(ag (ag
(ag (ag
(ag (rru
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Subjects
- Biochemistry
- Inorganic Chemistry
- Organic Chemistry
- Organic Reaction Mechanism
- Physical Chemistry
- Spectroscopy