Practice time! Identify the Peaks and Structure H-C C-CH2CH2CH3 LOD NHAIווארכולו NH₂ OH D 4000 3000 2000 1500 1000 500 HAVENUMBERI- Table L1.2: Characteristic IR Absorption Frequencies Bond Description Example (R=H or alkyl) Absorption Range (cm³) alcohol O-H R- H- alkyne 3200-3650 (broad, strong) 3260-3330 CSp-H R- R amine 3100-3500 N-H alkene R H 3050-3150 Cop2-H R alkane 2840-3000 R -H Cup 3-H (strong) alkyne 2100-2260 C=C R- -R carbonyl C=O 1690-1760 (strong) R R R alkene 1620-1680 C=C cm-1 R alcohol 1000-1260 C-O R3C OH