Final answer:
More complex molecules will have slower reaction rates due to their collision orientations.
Step-by-step explanation:
According to collision theory, more complex molecules will have slower reaction rates due to their collision orientations. The rate of a reaction depends on the frequency of collisions between reactant particles and their proper orientation at the time of collision. In more complex molecules, it may take a long time for the atom to collide with the molecule, and even when a collision occurs, it may not result in the breaking of a bond and the forming of another.