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: _______