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Identify the class and key features
Alcohol, broad peak at 3200-3600 for OH bond, narrow peak at 2720-3100 for CH bonds.

Identify the class and key features
Carboxylic Acid, broad peak at 2500-3000 for OH bond (masks the peaks present at 2720-3100 for CH bonds), strong narrow peak at 1700-1750 for C=O bond.

Identify the class and key features
Ester, strong narrow peak at 1700-1750 for C=O bond, weak narrow peak at 2720-3100 for CH bonds. No OH peaks at 2500-3000.

Identify the class and key features
Amine, strong narrow peak at 2720-3100 due to CH bonds, weak peak at 3300-3500 due to NH bonds, absence of broad OH peaks at 2500-3000.

Identify the class and key features
Amide, strong narrow peak at 1700-1750 due to C=O bond, narrow double peaks at 3300-3500 due to NH bonds, absence of broad OH peaks at 2500-3000.

Identify the class and key features
Ketone, strong narrow peak at 1700-1750 due to C=O bond, single peak at 2720-3100 for CH bonds.

Identify the class and key features
Aldehyde, strong narrow peak at 1700-1750 due to C=O bond, doublet at 2720-2820 due to CH bond stretch.