Of the following molecular properties, which is most closely related to IR spectroscopy?(A). The translational energy of molecules(B). The dipole moment(C). The nuclear spin moment(D). The types of molecular orbitals (sigma, Pi...)
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Of the following molecular properties, which is most closely related to IR spectroscopy?
(A). The translational energy of molecules
(B). The dipole moment
(C). The nuclear spin moment
(D). The types of molecular orbitals (sigma, Pi...)
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- 1. Suggest 3 applications of Raman spectroscopy. 2. How polarizability is related to electric dipole moment? 3. How does the induced dipole moment occur? 4. Give the general parts of a Raman spectrophotometer. 5. Raman spectroscopy and infrared spectroscopy measures the vibrational frequencies of a molecule. List the differences between these two spectroscopic techniques.Spectroscopy Drago book, second edition, chapter 9 electron paramagnetic resonance, page no 403 ques 11Consider HCN, which has three features in its IR spectrum: 946, 2380, and -1 3386 cm¹. (a) Sketch the motions of each normal mode and denote any degeneracies. (b) Assign each feature in the IR spectrum to a normal mode of the molecule. (c) Determine the zero-point energy of HCN.
- The bond length of the transient diatomic molecule CF is 1.291 Å; that of the molecular ion CF+ is 1.173 Å. Explain why the CF bond shortens with the loss of an electron. Refer to the proper MO correlation diagram.2. Molecules absorb IR radiation consistent with vibrational energy and rotational energy. Which of these is present in condensed phases (liquid, solution, solid)?Which of the following statements is FALSE? a.) The absorptions in IR are attributed to transitions between rotational energy levels of the molecules. b.) The UV spectrum provides information about the valence electrons. c.) UV absorptions are attributed to electronic transitions. d.) NMR spectrometers use radio frequency energy
- Why is the oxygen-hydrogen absorption of CH3OH such a broad band in the infrared? Rotational energy levels broaden the absorption а. b. Hyperconjugation resonance broadens the absorption Resonance broadens the absorption с. broadens the Hydrogen bonding absorption d.Determine the IR-active CO stretch vibration modes for the following molecules. Show procedures and calculations. a) fac-Fe(CO)3Cl3 b) Fe(CO)5 (triagonal bipyramid)(d) For the molecule AB2, discuss how you might use IR and Raman spectroscopy to determine the geometry (linear vs. bent) of the molecule and whether the molecule has a centre of symmetry. Include in your answer diagrams to illustrate the atom and bond motions involved in the normal vibrational modes of this molecule.
- 9. Consider the ethyl iodide molecule, CH CH₂, which of the statements below is correct? (A) CH, protons are more deshielded. (B) The energy gap between a and ß spin states of CH₂ protons is smaller than the counterpart of CH; protons. (C) The electronegative element I shields the CH₂ protons. (D) None of the above.Define and differentiate rotational spectroscopy, vibrational spectroscopy and electron spectroscopy.4. (a) Use the simple one-electron molecular orbital method, including overlap, to calculate the energies of the molecular orbitals of the hydrogen molecule (H₂) in terms of a, ß and S? (b) Calculate & given that a = -13.6 eV, that S = 0.6, and that the lowest UV absorption energy is 12 eV. (c) Determine the ionisation energy of the bonding molecular orbital in H₂ ? [6 marks]