# Bifunctionality

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{{short description|Organic molecule with two different functional groups}}

In [chemistry](/source/chemistry), '''bifunctionality''' or '''difunctionality''' is the presence of two [functional groups](/source/functional_groups) in a [molecule](/source/molecule). A bifunctional species has the properties of each of the two types of functional groups, such as an [alcohol](/source/Alcohol_(chemistry)) ({{chem2|\sOH}}), [amide](/source/amide) ({{chem2|\sCONH2}}), [aldehyde](/source/aldehyde) ({{chem2|\sCHO}}), [nitrile](/source/nitrile) ({{chem2|\sCN}}) or [carboxylic acid](/source/carboxylic_acid) ({{chem2|\sCOOH}}). Many bifunctional species are used to produce complex materials.  They participate in [condensation polymerization](/source/condensation_polymerization) like [polyester](/source/polyester) and [polyamide](/source/polyamide).

'''Polyfunctional''' species have more than two functional groups. Most biological compounds are polyfunctional.

==See also==
* [Functionality (chemistry)](/source/Functionality_(chemistry))

==References==
{{Reflist}}

==Further reading==
* ''[https://books.google.com/books?id=mGa7CgAAQBAJ Properties of Single Organic Molecules on Crystal Surfaces]''

{{Functional groups}}
{{Organic chemistry}}

Category:Functional groups
Category:Organic chemistry

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Adapted from the Wikipedia article [Bifunctionality](https://en.wikipedia.org/wiki/Bifunctionality) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Bifunctionality?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.