Problem: A compound has infrared absorptions at the following frequencies:1660 cm-1 and a single band at 3400 cm-1Suggest the likely functional group that may be present: _______

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Characteristic IR spectrum values:

  • Amide
  • N-H stretch → 3550 – 3200 cm-1
    • Primary (1°) → two bands
    • Secondary (2°) → one band
  • C=O stretch→ 1700-1630 cm-1


Given: 1660 cm-1  and single band at 3400 cm-1

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Problem Details

A compound has infrared absorptions at the following frequencies:

1660 cm-1 and a single band at 3400 cm-1

Suggest the likely functional group that may be present: _______

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the IR Spect: Structure Determination concept. If you need more IR Spect: Structure Determination practice, you can also practice IR Spect: Structure Determination practice problems.

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