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IR Absorption of Functional Groups

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Total cards: 18•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (18)

#1
Front (Question)

Alcohol (O-H)

Back (Answer)

3200-3600 strong, broad

#2
Front (Question)

Alkane (C-H)

Back (Answer)

2850-3000 strong

#3
Front (Question)

Terminal Alkene (=C-H)

Back (Answer)

3010-3100 medium

#4
Front (Question)

Alkene (C=C)

Back (Answer)

1620-1680 variable

#5
Front (Question)

Terminal Alkyne (≡C-H)

Back (Answer)

3300 strong and sharp

#6
Front (Question)

Amine (N-H)

Back (Answer)

3300-3500 medium (1° - two bands; 2° - one band)

#7
Front (Question)

Aromatic (C-H)

Back (Answer)

3000-3100 medium

#8
Front (Question)

Aromatic (C=C)

Back (Answer)

1400-1600 medium-weak, multiple bands

#9
Front (Question)

Ether (C-O)

Back (Answer)

1000-1300 (1070-1150) strong

#10
Front (Question)

Nitrile (C≡N)

Back (Answer)

2210-2260 medium

#11
Front (Question)

Nitro (N=O)

Back (Answer)

1515-1560 strong

#12
Front (Question)

Nitro (N-O)

Back (Answer)

1345-1385 Strong

#13
Front (Question)

Carboxylic Acid

Back (Answer)

C=O 1700-1725 strong + O-H 2500-3300 strong, very broad + C-O 1210-1320 strong

#14
Front (Question)

Aldehyde

Back (Answer)

C=O 1740-1720 strong + C-H 2820-2850 & 2720-2750 medium, two peaks

#15
Front (Question)

Aminde

Back (Answer)

C=O 1640-1690 strong + N-H 3100-3500 unsubstituted have two bands

#16
Front (Question)

Anhydride

Back (Answer)

C=O 1800-1830 & 1740-1775 strong (two bands) + C-O 1210-1320 strong

#17
Front (Question)

Ester

Back (Answer)

C=O 1735-1750 strong + C-O 1000-1300 strong (two bands or more)

#18
Front (Question)

Ketone C=O

Back (Answer)

1680-1850 strong