Question

Howard University Organic Chemistry 1 summer 2018 Final testDate: 21tJun 2018 Name: Jo uynedusu ID: 0002 7530xq Time: 1 hour Section A (40 points) Chose the right statement a. In NMR spectroscopy, sample is dissolved in a suitable solvent (usually deuteriowater, D,o) b. In NMR spectroscopy, sample is dissolved in a suitable solvent (usually chloroform, CHCb). c. In NMR spectroscopy, sample is dissolved in a suitable solvent 1- usually deuterlochloroform, CDC,). In NMR spectroscopy, sample is dissolved in a suitable solvent (usually aceton, CH,COCH). d. 2- Chose the right statement 1H and 13C nuclei are unique in their ability to exhibit the NMR phenomenon. an odd number of protons (1H, 2H, 14N, 19F, 31P) will not be applicable. 1H and 13C with an even number of protons are applicable. 1H and 13C nuclei are not unique in their ability to exhibit the NMR phenomenon. All nuclei with an odd number of protons (1H, 2H, 14N, 19F, 31P). Nuclel with a. b. nuclei are not unique in their ability to exhibit the NMR phenomenon. All nuclei c. d. None of them. Chose the right statement 3- The exact frequency necessary for resonance depends both on the strength of the external magnetic field and on the identity of the nuclei The exact frequency necessany for resonance depends both on the strength of the external mag The exact frequency necessary for resonance depends both on the identity of the nuclei and no matter the strength of the external magnetic field applied. All of them are applicable b. netic field unrelated to the identity of the nuclei c. d. 4- This reaction takes place through CI CI a. Carbocation intermediate formation b. Carbanion intermediate formation c. Radical intermediate formation d. Carbine intermediate formation

Answer 1

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