Sc The IK spectrum of an unknown compound is shown below. Circle the compound th

Question

Sc The IK spectrum of an unknown compound is shown below. Circle the compound that would be most consistent with this IR spectrum. Assign as many peaks as possible in the functional group region of the spectrum. Wave Number, cm 4000 30002500 2000 10o 130012001100 1000 00 8 3 4 5 67 9 10 11 12 13 14 15 Wavelength, microns 5d. The IR spectrum of an unknown compound is shown below. Circle the compound that would be most consistent with this IR spectrum. Assign as many peaks as possible in the functional group region of the spectrum. Wave Number, cm 700 1500 130012001100 1000 900 800 4000 30002500 2000 3 4 5 6789 10 11 12 13 14 15 Wavelength, microns

Explanation / Answer

5c. The compound is benzonitrile (middle one) with major band positions at 3066 cm -1(alkenyl C-H stretch), 2224 cm-1(CN stretch)

5d. The compound is propionic acid (middle one) with major peak positions at 2986 cm -1(O-H stretch), 1715 cm -1(C=O stretch), 1415 cm -1(C-O-H bend), 1240 cm -1 (C-O stretch)

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