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, thoughtco.com/definition-of-substituent-605701. Helmenstine, Anne Marie, Ph.D. (2014, June 28). Substituent Definition. Retrieved from https://www.thoughtco.com/definition-of-substituent-605701 Helmenstine, Anne Marie, Ph.D. "Substituent Definition." ThoughtCo. https://www.thoughtco.com/definition-of-substituent-605701 (accessed May 22, 2018).