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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.

Alkynes: HCC CH 3 Propyne 2200-2100 CCStretch 3100-3000 C=C-H Asymmetric Stretch 1600-1580 C-C=C Symmetric Stretch Aromatic Rings: C C C C C C H H H H H H Benzene 1500-1450 C-C=C Asymmetric Stretch Phenols & Alcohols: C C C C C C H H H H H OH C H OH H H Phenol Methanol (Alcohol) 3600-3100 (Note: Phenols MUST have Aromatic Ring Absorptions too ...

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