Definition of addition reaction
: a chemical reaction that results in a single product To try and explain what happens during these diamond reactions, Doren and Danesha Fitzgerald have used computational chemistry to model the way the molecules interact with the diamond surface. They have shown that the addition reactions work because pairs of carbon atoms on the naked surface of the diamond act as if they are themselves individual molecules. — David Bradley, The Guardian (London), 30 Nov. 2000
Note: The product of an addition reaction is called an addition compound.
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