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- 3 Convert the following infrared wavelengths to cm-1. 3.38 mm, typical for a saturated C¬H bondThe ground-state electron configuration of the H; molec- ular ion is (og15)'. (a) A molecule of H absorbs a photon, promoting the electron to the os molecular orbital. Predict what happens to the molecule. (b) Another molecule of H absorbs even more energy promoting the electron to the o,2, molecular orbital. Predict what happens to this molecule.Explain why a molecule with no dipole moment is microwave inactive but may show an infrared spectrum.Which of the following molecules may show infrared absorption spectra and, in each case, briefly explain why this is so: (i) H2, (ii) HCl, (iii) CO2 , and (iv) H2O?
- TOPIC: QUANTUM, ATOMIC AND MOLECULAR PHYSICIS (a) Using Hückel's method, describe the energy of the molecular orbitals T of cyclobutadiene C4H4, which is a flat molecule made up of a square ring of carbons, as shown in the figure; (b) Do the same for 1,3-butadiene C4H6, which is an elongated planar molecule, as shown in the figure. (c) In both cases, draw an energy diagram indicating the filling of the orbitals and identifying the HOMO and the LUMO. Sketch by hand schematically (using two colors to distinguish the lobes from the 2pz orbitals) the result obtained for the orbitals, identifying them with the corresponding energy. If possible, you can use the Orbital Viewer program to plot the orbitals.The figure shows the molecular structure of allicin, a pungent substance found in garlic that inhibits the growth of bacteria like Staphylococcus aureus. H H 1| H 7| || :0: нн H H Analyze this substance by determining the electronic and molecular geometry of each numbered atom. Yegor Larin/Shutterstock; Revell, Introductory Chemistry, 2e, © 2021 W. H. Freeman and Company4. (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]
- Which of the following molecules are diamagnetic: H2+1, H2, H2-1, H2-2?Draw the structure of the two tertiary (3°) amines with molecular formula C6H15N that contain a group with 3 carbon atoms in the largest group. You do not have to consider stereochemistry. You do not have to explicitly draw H atoms.What is the bond order and magnetic of F2+ ?