Wize University Organic Chemistry Textbook > Structure Elucidation (IR Spectroscopy, NMR, Mass Spectrometry)

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Prallethrin, a potent insect repellent used for the control of mosquitos, features a number of organic functional groups. Which key peaks would you use IR spectroscopy to detect?

Illustration for practice question: IR Spectroscopy: Structure Elucidation

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Below are the experimental IR, 1H and 13C NMR spectra of an unknown C11-organic compound, and the important MS data is given. What is the structure of the compound? Label relevant spectral data in each spectra you can use to base your assignment on (each spectra must be labelled).

MS peaks: 163 (100), 178 (21.0)

Illustration for practice question: NMR Spectra: Structure Elucidation

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Below are the experimental 1H and 13C NMR spectra of an unknown organic compound, and the MS and IR data is given. What is the structure of the compound? Label relevant spectral data in each spectra you can use to base your assignment on (each spectra must be labelled). The molecular ion is not observed in the MS spectra, so what are the peaks?

MS peaks [molecular ion not observed]: 43 (100), 71 (29); IR peaks: 2974 cm–1 and 1716 cm–1

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