Which of the following is true for diffusion controlled reactions?  a)The time required to break or form bonds is much more than the time required for the reactants to diffuse such that they are proximal to one another in the solution. b)The energy barrier associated with breaking or forming bonds is much higher than the barrier associated with the diffusion of the reactants to form the caged complex in the solution. c)Enzymes, at their initial stages of evolution toward a particular substrate, tend to operate at the diffusion limit. d)The rate of bond forming/breaking is much faster than rate required for a caged complex to separate.

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