Question

what is the breaking n making of bonds in a chemical reaction called ?

Answer 1

breaking of bond is called bond disassociation.
Making of bond is just bond formation, guess there is nothing called bond disassociation
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Answer 2

Energy is absorbed to break bonds. Bond-breaking is an endothermic process. Energy is released when new bonds form. Bond-making is an exothermic process. Whether a reaction is endothermic or exothermic depends on the difference between the energy needed to break bonds and the energy released when new bonds form.
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