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Summary of IR Stretching Frequencies

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Total cards: 17•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (17)

#1
Front (Question)

<p>alcohol (O-H)</p>

Back (Answer)

<p>3300 - always broad</p>

#2
Front (Question)

<p>amine, amide (N-H)</p>

Back (Answer)

<p>3300 - may be broad, sharp, or broad with spikes</p>

#3
Front (Question)

<p>alkyne </p>

Back (Answer)

<p>3300 - always sharp, usually strong</p>

#4
Front (Question)

<p>alkane (C-H)</p>

Back (Answer)

<p>just below 3000</p>

#5
Front (Question)

<p>alkene (C-H)</p>

Back (Answer)

<p>just above 3000</p>

#6
Front (Question)

<p>acid (O-H)</p>

Back (Answer)

<p>3000 - very broad</p>

#7
Front (Question)

<p>alkyne (C-C)</p>

Back (Answer)

<p>just below 2200</p>

#8
Front (Question)

<p>nitrile (C-triplebond-N)</p>

Back (Answer)

<p>just above 2200</p>

#9
Front (Question)

ketones

Back (Answer)

1710

#10
Front (Question)

aldehydes

Back (Answer)

about 1725 (C=O) and peaks at 2720 + 2820 (C-H)

#11
Front (Question)

<p>esters</p>

Back (Answer)

<p>higher than aldehydes, about 1735</p>

#12
Front (Question)

<p>alkene isolated (C-C)</p>

Back (Answer)

<p>1660</p>

#13
Front (Question)

<p>aromatic alkene (C-C)</p>

Back (Answer)

<p>aromatic double bond is about 1600</p>

#14
Front (Question)

imine (C=N)

Back (Answer)

stronger than C=C, 1660

#15
Front (Question)

alkene conjugated (C-C)

Back (Answer)

1630

#16
Front (Question)

acids

Back (Answer)

1710 (C=O) and broad, 2500-3000 (C-H)

#17
Front (Question)

amide

Back (Answer)

stronger than C=C