Does every collision between reacting particles lead to products? what other factor is involved?

If I am reading this question correctly, then the answer is "no, every collision between reacting particles lead to a product".  You have to address the energy component of the particles.  If there isn't enough energy to allow the reaction to occur, then the particles will elastically bounce off one another and no reaction will occur.  If there is enough energy, then the reaction will occur.