Atom or group of atoms that gives a molecule “personality.” (Molecules with that group behave alike.) Functional Group
R-X X = F, Cl, Br, I Halocarbon
R-OH Alcohol
R-O-R’ R, R’ = hydrocarbons Ether
R-CHO Aldehyde
R-C-R’ Ketone = O
R-COOH Carboxylic Acid
R C O R’ Ester = O
R-NH 2 Amine
R C NH 2 Amide = O
R CH C OH Amino Acid = O NH 2
C 4 H 9 OH Alcohol
CH 3 COOH Organic Acid
C2H5OC2H5C2H5OC2H5 Ether
CH 3 NH 2 Amine
CH 3 COOC 2 H 5 Ester
C 2 H 5 Br Halocarbon
C 2 H 5 OH Alcohol
CH 3 CH 2 CHO Aldehyde
C 4 H 9 CONH 2 Amide
C 2 H 5 OCH 3 Ether
CH 3 COOC 3 H 7 Ester
CH 2 (NH 2 )COOH Amino Acid
C 2 H 5 COCH 3 Ketone
C 2 H 5 COOH Organic Acid
C 2 H 5 NH 2 Amine
CCl 4 Halocarbon
HCOH Aldehyde
CH 3 COCH 3 Ketone
C 2 H 5 CONH 2 Amide