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- The stretching frequencies for H2, HD, and D2 are 4395, 3817, and 3118 cm-1 respectively. Why? Explain.The highest occupied molecular orbital of a molecule isabbreviated as the HOMO. The lowest unoccupied molecularorbital in a molecule is called the LUMO. Experimentally,one can measure the difference in energy betweenthe HOMO and LUMO by taking the electronic absorption(UV-visible) spectrum of the molecule. Peaks in theelectronic absorption spectrum can be labeled as π 2p-π 2p*,σ2s-σ2s*, and so on, corresponding to electrons being promotedfrom one orbital to another. The HOMO-LUMO transitioncorresponds to molecules going from their groundstate to their first excited state. (a) Write out the molecularorbital valence electron configurations for the ground stateand first excited state for N2. (b) Is N2 paramagnetic or diamagneticin its first excited state? (c) The electronic absorptionspectrum of the N2 molecule has the lowest energypeak at 170 nm. To what orbital transition does this correspond?(d) Calculate the energy of the HOMO-LUMO transitionin part (a) in terms of kJ/mol. (e) Is the…A typical vibrational frequency for a cabonyl is 1600-1900 cm ¹. For carbon monoxide, is approximately 2180 cm ¹. Which of the following is a reasonable explanation for why is larger for CO than for R'-C(=O)-R. O The force constant for C=O is larger than that for C-O due to the larger bond multiplicity. The reduced mass for C=O is larger than that for C-O due to the larger bond multiplicity. The force constant for C=O is smaller than that for C-O due to the larger bond multiplicity. The reduced mass for C=O is smaller than that for C-O due to the larger bond multiplicity.
- 3. State which of the following molecules have (a) rotational absorption spectra, i.e. are rotationally active, (b) vibrational absorption spectra, i.e. are vibrationally active: N2, HF, CS2, SO2, SO, C6H6.(g) Which of the following compound gives the largest vibrational frequency among H2, D2,HD, and Cl2? A. HD B. D2 C. H2 D. Cl2Calculate the energy in KJ/mol associated with the 3.517-μm vibrational absorption bandof an aliphatic ketone.
- What factors influence the wavelength of maximum emission and maximum excitation in fluorescence spectroscopy?The force constant for the bond in CO is 1857 N/m, Calculate the vibrational frequencies (in Hz) of 12C160, 13C160, 12C180, and 13C180. Use integer relative masses for this estimate.Which of the following molecules may show a pure rotational microwave absorption spectrum and, in each case, briefly explain why this is so: a. H₂ b. HCI C. CH4 d. CH3CI e. CH₂Cl₂.
- How do the following factors affect absorption frequencies? A. O-H vs O-D. B. CH stretch, hybrid orbitals used by carbon Please answer it in typewritten thank youAn electron in the 7 orbital of ethylene (C,H,) is excited by a photon to the * orbital. Do you expect the equilib- rium bond length in the excited ethene molecule to be greater or less than that in ground-state ethene? Will the vibrational frequency in the excited state be higher or lower than in the ground state? Explain your reasoning.6. The carbonyl stretching frequency for one of the following compounds is 1685 cm²¹. Which one and briefly explain.
