functional group
Noun
Meaning
(organic chemistry) A specific grouping of elements that is characteristic of a class of compounds, and determines some properties and reactions of that class.
Various functional groups often occur in biomolecules.
(ecology) A collection of organisms of specific morphological, physiological, behavioral, biochemical properties.
Source: en.wiktionary.orgExamples
Also, alkanes are generally unreactive chemically or biologically, and do not undergo functional group interconversions cleanly.
A functional group is a molecular module, and the reactivity of that functional group is assumed, within limits, to be the same in a variety of molecules.
If the addition of a functional group takes place at the less substituted carbon atom of the double bond, then the electrophilic substitution with acids is not possible.
A variety of isomers are known, but they all feature an amyl group attached to the nitrite functional group.
For example, in organic chemistry chemists are sometimes concerned only with the functional group of the molecule.
If the presence of another functional group demands the use of a suffix, the aldehyde group is named with the prefix formyl-.