I was solving some questions related chemical kinetics and encountered one question with multiple correct answer , the question is :
For a complex (multistep) reaction,
(a) the overall rate of reaction is the rate of slowest step.
(b) the overall molecularity has no significance.
(c) molecularity and order may or may not be same.
(d) the number of rate determining steps may be more than one.
The question have all the four options as correct answer. There's no doubt about first three options, but about the fourth one I want to ask , How a complex reaction have more than one rate determining steps? And if it has then how the overall order and molecularity of the reaction may be given as for complex reation we look at the slowest step and with the help of slowest step we decide the order and molecularity . Then with multiple RDS how it is possible ?