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O-H
3600-3200 (strong, broad)
Carboxylic acid O-H
2200-3600 (very broad)
Primary N-H
3300-3500 (2 signals)
Secondary N-H
3300-3500 (1 signal)
Alkyne C-H (sp)
3300 (strong)
Alkene C-H (sp2)
3000-3100
Alkane C-H (sp3)
2850-3000
Carbonyl C-H
2750 and 2850 (2 signals)
Carbonyl carbon (C=O)
1650-1820 (strong)
C=C
1600-1700
Aromatic
1450-1600, 1650-2000
C-C triple bond
2100-2200
C-N triple bond
2200-2300
Anhydride C=O
1820 and 1760
Acid chloride C=O
1790
Ester C=O
1735
Aldehyde C=O
1730
Ketone C=O
1720
Carboxylic acid C=O
1715
Amide C=O
1650