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20 August, 03:27

The labels on a shipment of the five chemicals A - E below were washed off by accident when the delivery truck went through a truckwash with the doors open. A clever student took infrared spectra of each of the resulting unknowns. Unknown #1 had a strong, broad IR absorption at 3400-3600 cm-1, and no absorptions between 1600 and 2900 cm-1. Unknown #2 had a strong absorption at 1680 cm-1 and no absorptions above 3100 cm-1. What are the structures of unknowns 1 and 2?

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  1. 20 August, 03:42
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    Unknown 1: - OH group at 3400-3600

    Unknown 2: Ketone and alkene group

    Step-by-step explanation:

    Unknown 1:

    This compound has a strong IR absorption at 3400 - 3600cm-¹; this indicates that it is an alcoholic group (OH)

    No absorption between 1600 and 2900cm-¹: this rule out the presence of ketone (C = O)

    Hence the unknown compound is OH group

    Unknown 2:

    This has strong IR absorption at 1680cm-¹: this indicates the presence of (C=O) group.

    No absorptions above 3100cm-¹: this indicates the presence of C = C - H

    So therefore, unknown 2 is most likely to be Ketone and alkene group
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