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- Dictionaryfunctional group
noun
- 1. a group of atoms responsible for the characteristic reactions of a particular compound.
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noun
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]] In organic chemistry, a functional group is a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions. The same functional group will undergo the same or similar chemical reactions regardless of the rest of the molecule's composition. This enables systematic prediction of chemical reactions and behavior of chemical compounds and the design of chemical sy... Wikipedia