A reaction in which ad-ditional atoms or groups of atoms are in-troduced into an unsaturated compound. Asimple example is the addition of bromineacross the double bond in ethene:H2C:CH2+Br2 →BrH2CCH2BrAddition reactions can be induced ei-ther by electroph......（本文共 326 字）     [閱讀本文] >>