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Aldehyde (Carbonyl group) R-(C=O)-H

Amine -- R-N-R

Alcohol (Hydroxyl group) R-OH

Carboxylic Acid (Carboxyl group) -- RCOOH

Amide (Carboxylic acid derivative) R-C=ON-R'

Ester (Carboxylic acid derivative) -- ROOR'

Thiol -- R-SH

Ketone -- R-(C=O)-R'

Ether -- R-O-R'