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Table 1: Principal IR Absorptions for Certain Functional ...

Table 1: Principal IR Absorptions for Certain Functional Groups Absorption Ranges(cm-1). Functional group Names Type of Vibration & [Look for a single absorption causing IR absorption in these regions, unless stated otherwise.]. Example compounds 3000-2800 H-C-H Asymmetric &. Alkanes: Symmetric Stretch (Note: The Absorptions can be seen as several H distinct peaks in this region.). H H. C Methane H 1500-1440 H-C-H Bend C=C-H Asymmetric Alkenes: 3100-3000. Stretch H. H C-C=C Symmetric H3C C 1-Propene 1675-1600. H. Stretch 3300-3200 C H Stretch Alkynes: HC C CH3 Propyne 2200-2100 C C Stretch Aromatic Rings: C=C-H Asymmetric 3100-3000. H Stretch H C H C-C=C Symmetric C C 1600-1580.

Nitro Groups: H C 3 N + O O Nitromethane (Note: Both peaks are <200 cm-1 apart.) 1400-1300 N=O Bend 3500-3100 N-H Stretch (similar to amines) 1670-1600 C=O Stretch Amides: H C 3 C NH 2 O Methanamide 1640-1550 N-H Bend

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