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31 Cards in this Set
- Front
- Back
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The frequency of a given stretching vibraiton in an IR spectrum can be related to two factors:
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1. the masses of the bonded atom
- lighter atoms vibrate @ higher frquencies than heavier ones 2. the relative stiffness of the bond - triple bonds are stiffer than double bonds - double bonds are stiffer than single bonds |
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All hydrocarbons give absorption peaks in what range?
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2800-3300
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The order of hybridized bond strength and bond stiffness:
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IR (alkyl):
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2853-2962 (medium to strong intensity)
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IR (alkyl):
isopropyl |
1380-1385 (strong intensity) and 1365-1370 (strong intensity)
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IR (alkyl):
tert-Butyl |
1385-1395 (medium intensity) and ~1365 (strong intensity)
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IR (alkenyl):
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3010-3095 (medium intensity)
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IR (Alkenyl):
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1620-1680 (Variable intensity)
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IR (alkenyl):
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985-1000 (strong) and 905-920 (strong)
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IR (alkenyl)
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880-900 (strong)
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IR (alkenyl)
trans double bond |
960-975 (strong)
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IR (Alkynyl):
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~3300 (Strong)
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IR (alkynyl):
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2100-2260 (variable)
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IR:
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~700 (sharp and strong)
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IR:
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1000-1200 (sharp and strong)
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IR:
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1360-1380 (sharp and strong)
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IR: Nitro
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~1300 & 1500 (sharp and strong)
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IR: areomatic
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1450-1600 (Sharp/ variable And medium)
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IR:
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~1600 (sharp and medium to veriable intesity)
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IR (amides):
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<1700 (sharp and strong)
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IR (aldehydes, ketones, esters, carboxylic acids, amides)
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1700-1750 (Sharp and strong)
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IR:
Aldehyde |
2700
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IR:
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< 3000
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IR:
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> 3000 (Sharp and Variable)
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IR:
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~ 3100 (sharp and strong)
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IR:
OH w/ H-bonding |
3100-3500 (broad and varying)
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IR:
Aldehydes |
1690-1740 (strong peak)
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IR:
Ketone |
1680-1750 (strong peak)
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IR:
Ester |
1735-1750 (strong peak)
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IR:
Carboxylic Acid |
1710-1780 (strong peak)
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IR:
Amide |
1630-1690 (strong peak)
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