Southern Medical University - CHEM 3371TEST BANKS TEST ONE.

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Chapter 13: Mass Spectrometry and Infrared Spectroscopy 1. In electron impact mass spectrometry (EIMS), what is being detected? A) The molecular mass of the compound B) The molecular formula of the... compound C) The mass to charge ratio of any ionic species D) The mass to charge ratio of any neutral species 2. What type of feature will be observed in the EI mass spectrum of chlorobenzene? A) An absorption at 3100 cm–1 B) A signal at 113. C) A signal at 112 and a signal at 114 in a ratio of 3:1 D) A signal at 112 and a signal at 114 in a ratio of 1:1 3. You observe a compound that exhibits a mass spectrum with peak at 160 and a peak at 162, both of equal intensity. This compound contains: A) Two chlorine atoms C) One bromine atom B) One iodine atom D) Two bromine atoms 4. What type(s) of molecular motion is (are) observed using infrared spectroscopy? A) Stretching and bending C) Spin flipping B) Rotation and excitation D) Fragmentation 5. The functional group region of an infrared spectrum is: A) Where the cations appear C) Less than 1500 cm–1 B) Greater than or equal to 1500 cm–1 D) Greater than or equal to 2500 cm–1 6. Stronger bonds will be found where in the infrared spectrum? A) Higher molecular weight C) Lower wavenumbers B) Lower molecular weight D) Higher wavenumbers 7. Compared to a C–H bond, a C–D bond will vibrate where in the infrared spectrum? A) Higher molecular weight C) Lower wavenumbers B) Lower molecular weight D) Higher wavenumbers 8. Why does an alkyne carbon–carbon triple bond vibrate at a higher wavenumber than an alkene carbon–carbon double bond? A) It is stronger. C) It has fewer hydrogens. B) It is weaker. D) It makes a less stable cation [Show More]

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