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Csp3-H
3000-2850
Csp2-H
3150-3000
alkene
1650
Csp-H
3300
alkyne
2250
benzene
1600, 1500
alcohol
3600-3200
amine
3500-3300
number of peaks correlates with number of hydrogens
aldehyde Csp2-H
2830-2700
aldehyde C=O
1730
ketone
1715
ester
1745-1735
amide C=O
1680-1630
amide N-H
3400-3200
carboxylic acid O-H
3500-2500
carboxylic acid C=O
1710
nitrile C=N
2250