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Characteristic absorption frequencies in IR spectroscopy

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Bond type	Frequency(cm^-1)
C-H alkane	2950 – 2850
C-H alkene	3080 – 3020
C-H aldehyde	~2900
C-H alkyne	~3300
alkyne triple bond	2250 – 2100 (s)
alkene double bond	1680 - 1620 (s)
carbonyl, ketone	1725 – 1700 (s)
carbonyl, aldehyde	1740 – 1720 (s)
carbonyl, ester	1750 – 1730 (s)
carbonyl, acid	1725 – 1700 (s)
carbonyl, amide	1690 – 1650 (s)
O-H, alcohol	3600 – 3200 (s, broad)
O-H, acid	3000 – 2500 (s, broad)
C-O, alcohol, ester, ether	1300 - 1000