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Functional group
atom or group of atoms with characteristic chemical and physical properties
“R” convention
rest of the molecule
Alkane *not really a functional group
R — H
Alkene
R2C — CR2, R = H or alkyl group
Alkyne
RC = CR, R = H or alkyl group
Arene
aromatic ring
Alcohol (hydroxy)
R — OH
Ether
R — OR, R ≠ H
Amine (amino)
R — NH2, R2NH, R3N
Thiol (mercapto)
RSH
Sulfide
RSR
Halide
R — X, X = halogens (F, Cl, Br, I)