Ask Question
6 January, 14:19

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?

+2
Answers (1)
  1. 6 January, 15:59
    0
    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
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “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 ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers