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- Carboxylic Acid
- OH present
- Strong 3300-2500
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- Amide
- Medium broad absorption 3500-3300
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- Tertiary amide
- Do not show any strong absorption
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- Acetic anhydride
- Two strong C=O absorption near 1810 and 1760 cm-1
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- Ketones
- other 5 options have been eliminated
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- Alcohol
- • Strong, broad absorption; region 3650 - 3200 cm-1
- • Confirm by finding strong νC-O in the region 1250 - 1050 cm-1
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- Amine
- • Is N-H present?
- • Medium, broad absorption; region 3500 - 3300 cm-1
- • Sometimes a double peak with equivalent halves
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- • Confirm by finding strong νC-O in the region 1250 - 1050 cm-1
- • Absence of νO-H
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- Double Bond
- • ν C=C: weak absorption, 1680 - 1600 cm-1
- • Aromatic rings: medium to strong, 1650 - 1450 cm-1
- • Aromatic and vinyl νC(sp2)-H: to the left of 3000 cm-1
- • Aliphatic νC(sp3)-H: to the right of 3000 cm-1
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- Aromatic Ring
- • ν C=C: weak absorption, 1680 - 1600 cm-1
- • Aromatic rings: medium to strong, 1650 - 1450 cm-1
- • Aromatic and vinyl νC(sp2)-H: to the left of 3000 cm-1
- • Aliphatic νC(sp3)-H: to the right of 3000 cm-1
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- Triple Bond
- • ν C≡C: medium,sharp absorption, 2260 - 2100 cm-1
- • Check for νC(sp)-H near 3300 cm-1
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