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StuDocu is not sponsored or endorsed by any college or university Chapter 13 Organic Chemistry Test Questions Organic Chemistry Laboratory (Louisiana Tech University) Downloaded by Jean Hachem ([email protected]) lOMoARcPSD|3952052
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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 compoundB)The molecular formula of the compoundC)The mass to charge ratio of any ionic speciesD)The mass to charge ratio of any neutral species 2.What type of feature will be observed in the EI mass spectrum of chlorobenzene? 3.You observe a compound that exhibits a mass spectrum with peak at 1l0 and a peak at 1l2, both of equal intensity. This compound contains: 4.What type(s) of molecular motion is (are) observed using infrared spectroscopy? 5.The functional group region of an infrared spectrum is: A)Where the cations appearC)Less than 1500 cm–1B)Greater than or equal to 1500 cm–1D)Greater than or equal to 2500 cm–1 l. Stronger bonds will be found where in the infrared spectrum? Page 1 Downloaded by Jean Hachem ([email protected]) lOMoARcPSD|3952052
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Chapter 13: Mass Spectrometry and Infrared Spectroscopy 7.Compared to a C–H bond, a C–D bond will vibrate where in the infrared spectrum? 8.Why does an alkyne carbon–carbon triple bond vibrate at a higher wavenumber than an alkene carbon–carbon double bond? 9.Why is the infrared absorption for the stretching motion of internal alkynes rarely observed? A)They do not form cations.B)They are too strong.C)Stretching in internal alkynes does not involve a change in dipole moment.D)They do not have hydrogens. 10.Consider the three organic compounds drawn below. Which of the following statements is (are) true about the IR spectra of I, II, and III?
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