Is the chemical bond formation an exothermic or a endothermic process? If it is an exothermic reaction, why energy is released again during bond breaking?
Bond breaking requires energy; bond making releases energy. This is a mantra you simply must learn.
We recognize that hydrocarbon combustion is an exothermic reaction:
Looking at this reaction, clearly we have to BREAK strong
Of course, by convention, if energy is released a negative sign is associated the term;