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- The longest wavelength electronic transition in simple unsaturated hydrocarbons corresponds to a transition from the highest occupied molecular orbita l (HOMO) to the lowest unoccupied molecular orbita l (LUMO) . Predict the energy of the HOMO to LUMO separation in (a) ethane. (b) butadiene. and (c) benzene.Write the equation and the corresponding mechanisms for the Diels-Alder reactions ofcyclopentadiene with EACH of the following compounds:(a) Vinyl acetate(b) Acrylic acid(c) Dimethyl acetylenedicarboxylateExplain in detail how the spectroscopic data shows that cyclohexanol, the reactant, produced the expected product, cyclohexene. Is the product pure? How do you know? Refer to specific frequencies in the IR spectrum and specific signals in the NMR spectra to support your conclusion.
- C. Which FTIR spectra correspond to (a) PVAc and (b) PVA? Justify your answer. D. Poly(vinyl butyral), or PVB, is a thermoplastic polymer used as an interlayer in laminated glass, paints, lacquers, varnishes, and adhesives. The structure of PVB is shown below. Show how you will prepare PVB from PVA.(a) Explain how pyrrole is isoelectronic with the cyclopentadienyl anion.(b) Specifically, what is the difference between the cyclopentadienyl anion and pyrrole?(c) Draw resonance forms to show the charge distribution on the pyrrole structure.Ultraviolet and visible molecular absorption spectroscopy is used primarily for quantitative analysis. On the other hand Infrared absorption spectroscopy is a very powerful tool for determining the identity and structure of both inorganic and organic compounds. Which of these statements is correct? Only the first statement is correct Only the second statement is correct Both statements are correct None of the statements is correct
- Predict the characteristic infrared absorptions of the functional groups in the following molecules. (a) cyclohexene (b) pentan-2-ol (c) pentan-2-one(b) Ozonolysis of 2,7-dimethyl-4-octyne gave compound E. 0 Show the reaction involved for the formation of compound E. (i) By using the IR spectra of the reactant and product, determine the differences in their absorption bands when the reaction is completed.(C) Provide the starting materials (diene and dienophile) necessary to form the ind product through a Diels-Alder reaction (beware of the stereochemical information). (a) (b) (c) (d) - Diene - Dienophile- Diene Dienophile - Diene + Dienophile- -Diene Dienophile- A Dor Br Br A ✓ CO₂Me CO₂Me A 4 A MeO CN
- explain IR data and any information discern from it. This IR is Benzophenone IR1. A) What type of shift has occurred to anthracene when compared to benzene? Explain your answer. Bonzene Naphthalene Anthracene Fig.1 Structures of Benzene, Naphthalene, and Anthracene 30 2.0 Benzene Naphthalohe Anthracene 1.0 220.0 300.0 400.0 500.0 00.0 700.0 m Fig.2 Absorption Spectra of Benzene, Naphthalene, and Anthracene(a) Determine if the compounds below are aromatic compounds. Explain your answer. (i) Cyclodecapentaene (ii) Cyclopentadiene