LO0 TABLE 18.2 Characteristic infrared absorption peaks of functional groups Vibration Position (cm) Intensity Comment Alkanes C-H stretch 2962-2853 m to s C-H bend 1470-1430 and 1375-1365 m to w Alkenes =C-H stretch 3100-3010 C=C stretch C-H bend m 1680-1640 (sat.), 1630-1590 (conj. w to m 995-685 See Table 18.3 for detail. Alkynes =C-H stretch 3300-3200 C=C stretch 2250-2100 m to w Aromatic C-H stretch 3080-3020 m to w C=C stretch C-H bend 1650-1580 m to w 900-680 See Table 18.3 for detail. Alcohols
LO0 TABLE 18.2 Characteristic infrared absorption peaks of functional groups Vibration Position (cm) Intensity Comment Alkanes C-H stretch 2962-2853 m to s C-H bend 1470-1430 and 1375-1365 m to w Alkenes =C-H stretch 3100-3010 C=C stretch C-H bend m 1680-1640 (sat.), 1630-1590 (conj. w to m 995-685 See Table 18.3 for detail. Alkynes =C-H stretch 3300-3200 C=C stretch 2250-2100 m to w Aromatic C-H stretch 3080-3020 m to w C=C stretch C-H bend 1650-1580 m to w 900-680 See Table 18.3 for detail. Alcohols
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Can you answer both of these questions regarding the IR absorbtion

Transcribed Image Text:LD
Characteristic infrared absorption peaks of functional groups
TABLE
18.2
Vibration
Position (cm-)
Intensity
Comment
Alkanes
C-H stretch
2962-2853
m to s
C-H bend
1470-1430 and 1375–1365
m to w
Alkenes
=C---H stretch 3100-3010
C=C stretch
С—Н bend
1680–1640 (sat.), 1630–1590 (conj.)
w to m
995-685
See Table 18.3 for detail.
Alkynes
=C-H stretch 3300-3200
50
C=C stretch
2250-2100
m to w
Aromatic
C-H stretch
C=C stretch
3080-3020
m to w
1650–1580
m to w
C-H bend
900-680
See Table 18.3 for detail.
Alcohols
0-H stretch
3650-3550
Free
3550-3300
br, s
Hydrogen bonded
C-O stretch
1260-1000
Amines
D
N-H stretch
3500-3100
br, m
1° (two bands), 2° (one band)
4000
3000
2000
1500
1000
500
Nitriles
HAVENUMBERI -1l
C=N stretch
2280-2200
Aldehydes
C-H stretch
2900–2820 and 2775–2700
H-C=O
w
C=O stretch
1740–1720 (sat.), 1705–1680 (conj.)
H,C
CH3
Ketones
C=0 stretch
1725–1705 (sat.), 1685–1665 (conj.)
Esters
A
H
HO,
В
C=O stretch
1750–1735 (sat.), 1730–1715 (conj.)
C-O stretch
1250–1160
5
Acids
Diethyl amine
0-H stretch
C=0 stretch
3500-2500
m
1725-1700 (sat.), 1715–1680 (conj.)
Amides
Benzoic acid
N-H stretch
C=O stretch
3500-3150
1° (two bands), 2° (one band)
m
1680–1630
CH,OH|
Anhydrides
C=O stretch
C-O stretch
1850–1800 and 1790–1740
1050-900
CH,OH
Acid chlorides
C
D
C=O stretch
1820-1770
Nitro
NO, stretch
1660–1490 and 1390–1260
Benzyl alcohol
Methanol
a. s= strong, m = medium, w = weak, br = broad
b. sat. = saturated; conj. = conjugated
TEHNSHLTTANCETI

Transcribed Image Text:LOD
TABLE 18. 2 Characteristic infrared absorption peaks of functional groups
Vibration
Position (cm-')
Intensity
Comment
Alkanes
C-H stretch
C-H bend
2962–2853
m to s
1470-1430 and 1375–1365
m to w
Alkenes
=C--H stretch 3100-3010
C=C stretch
1680–1640 (sat.), 1630–1590 (conj.
w to m
C-H bend
995-685
See Table 18.3 for detail.
Alkynes
=C-H stretch 3300-3200
50
C=C stretch
2250-2100
m to w
Aromatic
C-H stretch
3080–3020
1650–1580
m to w
C=C stretch
m to w
C-H bend
900-680
See Table 18.3 for detail.
Alcohols
0-H stretch
3650–3550
m
Free
3550-3300
br, s
Hydrogen bonded
C-O stretch
1260-1000
Amines
N-H stretch
3500–3100
br, m
1° (two bands), 2° (one band)
4000
3000
2000
1500
1000
500
Nitriles
HAVENUMBER I -l
C=N stretch
2280–2200
Aldehydes
C-H stretch
2900-2820 and 2775-2700
H-C=0
w
C=O stretch
1740–1720 (sat.}, 1705–1680 (conj.)
Ketones
C=0 stretch
1725–1705 (sat.), 1685–1665 (conj.)
Esters
C=0 stretch
1750-1735 (sat.), 1730–1715 (conj.)
A
H,C
H,C
OCH,CH,
C-O stretch
1250–1160
5
Acids
0-H stretch
C=0 stretch
3500-2500
Ethyl acetate
1725–1700 (sat.), 1715–1680 (conj.)
p-Anisaldehyde
Amides
3500-3150
1680–1630
1° (two bands), 2° (one band)
N-H stretch
m
C=0 stretch
Anhydrides
C=O stretch
C-O stretch
1850–1800 and 1790–1740
1050-900
`CH,
ОН
Acid chlorides
C=0 stretch
C
1820-1770
Nitro
NO, stretch
1660–1490 and 1390–1260
Benzoic acid
a. s= strong, m = medium, w = weak, br = broad
b. sat. = saturated; conj. = conjugated
TEHNSHLTTANCETAT
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