Problem: A compound has infrared absorptions at the following frequencies:1650 cm-1, 3200 and 3400 cm-1 (both weak)Suggest the likely functional group that may be present:esterketonecarboxyl groupsecondary aminealcoholetheraldehyde primary amine primary amidesecondary amide tertiary amine tertiary amide

FREE Expert Solution
  • Two signals at 3200 and 3400 cm-1
  • Another signal at 1650 cm-1 → suggests carbonyl
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Problem Details

A compound has infrared absorptions at the following frequencies:

1650 cm-1, 3200 and 3400 cm-1 (both weak)

Suggest the likely functional group that may be present:

ester

ketone

carboxyl group

secondary amine

alcohol

ether

aldehyde 

primary amine 

primary amide

secondary amide 

tertiary amine 

tertiary amide

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Our tutors have indicated that to solve this problem you will need to apply the Infrared Spectroscopy Table concept. You can view video lessons to learn Infrared Spectroscopy Table. Or if you need more Infrared Spectroscopy Table practice, you can also practice Infrared Spectroscopy Table practice problems.