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Chemistry LibreTexts

IR10. More Practice with IR Spectra

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    • Problem IR.15.
    1. Identify at least three important peaks/bonds in each of the following IR spectra.
    2. Identify the functional group present in each of these samples. See the Functional Group Section for help.
    3. Draw a possible structure for each of these compounds (there may be many, many correct answers).

    Problem IR.16.

    Sketch an approximate IR spectrum for each of the following compounds:

    Problem IR.17.

    The oop bends are sometimes useful in distinguishing substitution pattrens around a benzene ring. Using the spectra of o-, m-, and p-xylene, formulate some guidelines about what the oop bends look like when substituents are one, two or three carbons away on a benzene ring.

    Figure IR18. IR spectrum of m-xylene.

    Source: SDBSWeb : http://riodb01.ibase.aist.go.jp/sdbs/ (National Institute of Advanced Industrial Science and Technology of Japan, 14 July 2008)

    Figure IR19. IR spectrum of o-xylene.

    Source: SDBSWeb : http://riodb01.ibase.aist.go.jp/sdbs/ (National Institute of Advanced Industrial Science and Technology of Japan, 14 July 2008)

    Figure IR20. IR spectrum of p-xylene.

    Source: SDBSWeb : http://riodb01.ibase.aist.go.jp/sdbs/ (National Institute of Advanced Industrial Science and Technology of Japan, 14 July 2008)