Explain the rotation and vibration spectra of molecules in their fundamental electronic state.

What is the molecular and electronic configuration for H2CO

5. In an IR spectrum, the x axis represents wavenumber of the light being absorbed by bond vibrations. The wavenumber is (B) directly proportional to the frequency. (A) directly proportional to the wavelength. (C) inversely proportional to the energy of the wave. (D) None of the above.

All carbon-to-carbon bond lengths are identical in benzene. Does this argue for or against the presence of C=C bonds in benzene? Explain.

6) This question is concerned with vibrational spectra (Infrared and Raman). a) How many normal modes of vibration are expected in these molecules? (Show calculations) i) Theobromine (the caffeine-like stimulant that is found in chocolate) b) In the molecular vibration shown here for trans-1,4-dichlorocyclohexane, both chlorine atoms stretch away from the carbon to which they are bonded (arrows). Will this mode be IR active? Will this mode be Raman active? In each case, why or why not? ii) Cyanopolyyne (an organic molecular wire that has been detected spectroscopically in interstellar space, and is postulated to be a precursor to biomolecules: HC=C-C=C-C=N c) Why are CH4 and CO₂ considered greenhouse gases, but O₂ and N₂ are not? d) Are the vibrations shown here a degenerate pair (Yes/No)? Why or why not? HN CI CH3 ci↑ ∙H -F CH3 -F

13C NMR spectroscopy provides valuable information about the environments of a molecule's carbon atoms. Since carbon atoms are often connected to hydrogen atoms, which could split the carbon signal through spin-spin coupling, the coupling between C and H is often "turned off" through the use of broadband decoupling, causing each C signal to appear as a singlet. Draw an isomer of C5H11Cl that would be expected to have four resonances in its 13C NMR spectra.

3. Predict the ground electronic state for each of the following molecules: (a). C₂ (b). N₂ (c). N₂O (d). F₂* (e). BF3

From the ground-state electron configurations of B2 andC2, predict which molecule should have the greater dissociation energy.

Questions 6a, b, c, d is linked to one another and focus on the molecule shown below. H ба) Before we can start assigning hybridization, we need to correctly assign our VSEPR electron-pair geometries to each central atom. For each of the chosen central atom, match it with it's corresponding electron-pair geometry. Drag and drop options on the right-hand side and submit. For keyboard navigation. SHOW MORE V C1 trigonal planar c C2 linear O N1 tetrahedral C trigonal pyramidal N 01 tetrahedral N trigonal planar o Bent O tetrahedral O :0: :0= II II I-0 - -I I-z: I

Write a resonant structure for the molecule of dicyanamide. All atoms should satisfy theirstability rules. This one should feature two formal charges.