CHE-10 SPECTROSCOPY
1. With help of a suitable diagram, discuss the range of electromagnetic spectrum.
2. Explain the vector nature of orbital angular momentum of an electron.
3. List various symmetry elements and symmetry operations associated with them.
4. Using a suitable diagram, explain that for a rigid diatomic molecule, the spectral lines are equally spaced in the rotational spectrum.
5. What are symmetric top molecules? Give the expression for and the selection rules for these molecules.
6. If the fundamental transition for O-H species is observed at 3735 cm-1 , find out the position of the corresponding transition for O-D species.
7. Discuss the IR spectrum of CO2 molecule.
8. 1-Butene absorbs at 1650 cm-1 while 1, 3-butadiene absorbs at 1610 cm-1 in the IR spectrum. Explain
9. State mutual exclusion principle. Give an example to explain it.
10. Compare the characteristics of Raman and IR spectra.
11. Derive the term symbol for the first excited state of H2 molecule.
12. Illustrate various electronic transitions and arrange them in the decreasing order of their energy.
13. What are charge transfer spectra? Explain giving a suitable example.
14. Answer the following:
(i) What is the role of littron mirror in an IR spectrometer?
(ii) Why glass cell cannot be used for IR spectroscopy?
(iii) What are the basic requirements of any container which holds the sample?
(iv)What is the significance of monochromators?
v) What are the sources of radiation in Raman spectrometer?
15. What are relaxation phenomena in 1H-NMR spectroscopy? Explain.
16. (i) Explain chemical shift. Give its units.
ii) What is chemical exchange? Explain.
17. Discuss the ESR spectrum of deuterium.
18. Describe the methods of ionization used in mass spectrometry.
19. What information can be obtained by analysing the 1H- NMR spectrum of an organic compound?
20. What spectral data will be obtained for ethyl iodide? Explain.
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