Substituent Definition

This is the two-dimensional chemical structure of toluene, also known as methylbenzene or toluol.
This is the chemical structure of toluene. The methyl group, CH3 is a substituent attached to a benzene ring. NEUROtiker, public domain

Definition: A substituent is an atom or functional group that replaces a hydrogen atom on a hydrocarbon.

In chemical structures, generic substituents are denoted by a capital R. If the substituent is a halide, a capital X.

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Helmenstine, Anne Marie, Ph.D. "Substituent Definition." ThoughtCo, Jun. 28, 2014, Helmenstine, Anne Marie, Ph.D. (2014, June 28). Substituent Definition. Retrieved from Helmenstine, Anne Marie, Ph.D. "Substituent Definition." ThoughtCo. (accessed May 22, 2018).