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alcohol
~3400 cm-1 (broad)
amine
~3400 cm-1 (less intense)
carboxylic acid
~3300-2500 cm-1 (broad peak, overlaps 3000 region)
sp C-H
~3300 cm-1
sp2 C-H
~3100 cm-1
sp3 C-H
~2950-2850 cm-1
C≡C
~2260 cm-1 (medium to weak intensity)
C≡N
~2260 cm-1 (medium intensity)
C=O
~1780 cm-1 (sharp)
C=N
~1650 cm-1 (less intense)
C=C
~1600 cm-1 (lesser intense)
C-O
~1250-1050 cm-1
benzene ring
~1600 and ~1500-1430 cm-1
aldehyde
~1700-1750 cm-1