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    Infrared and Mass Spectroscopy

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    4. Infrared Spectroscopy
    (a) Deduce a possible structure for the compound with the following major IR absorptions. Explain your choice based on the IR absorptions, indicating the absorptions on your molecule. C4H8O: 3000, 2850 (weak), 2715 (weak), 1730 (strong) cm^-1.
    (b) How could you use IR spectroscopy to distinguish between CH3OCH2CH3 and CH3CH2CH2OH?
    (c) Give an example of a molecule with an IR inactive vibration.

    5. Mass Spectroscopy
    Shown below is the mass spectrum for propane. Respond to the questions below:
    (a) circle the parent peak; indicate its m/z value
    (b) draw an arrow pointing to the base peak; indicate its m/z/ value
    (c) draw the structure of the base peak
    (d) identify the fragment at 15m/z
    (see attached file for diagram)
    (e) What evidence in a mass spectrum alerts the chemist to the presence of chlorine in a molecule?

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    Solution Summary

    This solution involves answering questions regarding infrared and mass spectroscopy.