C343S2009Quiz1v1KEY

C343S2009Quiz1v1KEY - C343/S2009 version 1 February 5, 2009...

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Unformatted text preview: C343/S2009 version 1 February 5, 2009 Quiz 1, version 1 IR spectroscopy 1. IR spectra can be taken of compounds dissolved in solution. Use your knowledge of IR to predict which of the following solvents would be best to use when taking an IR spectrum. a. toluene b. ethanol c. CCl4 d. methanol e. water 2. Which of the following represents the correct relative energies? a. ultraviolet light > visible light > infrared radiation > microwaves > radio waves b. visible light > ultraviolet light > infrared radiation > radio waves > microwaves c. microwaves > infrared radiation > visible light > ultraviolet light > radio waves d. radio waves > visible light > ultraviolet light > microwaves > infrared radiation e. infrared radiation > ultraviolet light > visible light > microwaves > radio waves 3. Which of the following is a false statement? a. The functional group region is higher in energy than the fingerprint region. b. It requires more energy to stretch a bond than to bend it. c. High frequencies, large wavenumbers, and short wavelengths are associated with high energy. d. Electromagnetic energy with wavenumber 100 cm‐1 is higher in energy than electromagnetic energy with wavenumber 1000 cm‐1. e. Rocking, scissoring, wagging, and twisting are types of bending vibrations. 4. What is the effect of resonance on the position of a C=O stretch? a. It is shifted to lower wavenumbers and broadens. b. It is shifted to higher wavenumbers and remains sharp. c. It stays at the same wavenumber and broadens. d. It is shifted to higher wavenumbers and broadens. e. It is shifted to lower wavenumbers and remains sharp. 5. What functional group is likely to be present in the molecule responsible for the following infrared spectrum below? a. b. c. d. 6. What functional group is likely to be present in the molecule responsible for the following infrared spectrum? a. b. c. d. C343/S2009 version 1 February 5, 2009 7. Identify the sentence that best fits the information about spectra A and B below for a compound with molecular formula C7H14O. a. b. c. d. e. Spectrum A is an alkene; spectrum B is a ketone. Spectrum A is an aldehyde; spectrum B is a ketone. Spectrum A is a ketone; spectrum B is an alkene. Spectrum A is an ether; spectrum B is a ketone. Spectrum A is an aldehyde; spectrum B is an alkene. 8. Identify the sentence that best fits information about spectra C and D below. a. b. c. d. e. Spectrum C is an alkene; spectrum D is an internal alkyne. Spectrum C is for a terminal alkyne; spectrum D is an internal alkyne. Spectrum C is for a terminal alkyne; spectrum D is a nitrile. Spectrum C is a nitrile; spectrum D is a terminal alkyne. Spectrum C is a nitrile; spectrum D is an alkene. 9. Which of the following shows the correct relative positions of bonds in terms of decreasing wavenumber? a. C C > C=C > O–H > C=O b. O–H > C C > C=O > C=C c. O–H > C=O > C C > C=C d. O–H > C=C > C C > C=O e. C C > O–H > C=C > C=O 10. Which of the following is not a true statement (i.e. which is false)? a. C=N stretch occurs at a greater wavenumber than a C–N stretch. b. C=O stretch occurs at a greater wavenumber than a C=C stretch. c. C=C‐H stretch occurs at a greater wavenumber than a C C‐H stretch. d. C–H stretch occurs at a greater wavenumber than a C–H bend. e. C=O stretch occurs at a greater wavenumber than a C–O stretch. ...
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