Illustrated Glossary of Organic Chemistry

Disubstituted: A molecule or functional group in which two hydrogen atoms have been replaced by other atom(s) or group(s). These substituents are not limited to methyl groups as shown here. When considering alkene stability, only carbon substituents matter (i.e., -CH₃ or -Ph matter but -Br or -OCH₃ do not). In the following examples, the substituents are shown in red.

Benzene No substituents		Toluene A monosubstituted benzene One substituent		1,2-Dimethylbenzene A disubstituted benzene Two substituents		1,2,3-Trimethylbenzene A trisubstituted benzene Three substituents		1,2,3,4-Tetramethylbenzene A tetrasubstituted benzene Four substituents
Ethylene No substituents		Propene A monosubstituted alkene One substituent		Z-2-Butene A disubstituted alkene Two substituents		2-Methyl-2-butene A trisubstituted alkene Three substituents		2,3-Dimethyl-2-butene A tetrasubstituted alkene Four substituents