
In organic molecules, functional groups are atom or atoms which are responsible for the characteristic properties of that molecule with the exceptions of double and triple bonds which are also functional groups. Some common functional groups are -COOH (carboxylic acids), -CHO (aldehyde), -CONH2 (amide), -CN (nitrile), -OH (alcohol) etc. When two o...
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http://en.wikipedia.org/wiki/Bifunctional

Referring to a molecule containing two reactive functional groups; cross-linking reagents are bifunctional compounds. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: bī-fŭngk′shŭn-ăl Definitions: 1. Referring to a molecule containing two reactive functional groups; cross-linking reagents are bifunctional compounds.
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http://www.medilexicon.com/medicaldictionary.php?t=10140

bifunctional 1. Having two functions; such as, bifunctional neurons. 2. In chemistry Having or involving two functional groups or binding sites; such as, bifunctional reagents.
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http://www.wordinfo.info/words/index/info/view_unit/864/

having or serving two functions. · having or involving two functional groups.
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https://www.infoplease.com/dictionary/bifunctional
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