Answer:
A complex reaction occurs through a number
of steps i.e., elementary reactions. Number of molecules involved in each
elementary reaction may be different, i.e., the molecularity of each step may
be different. Therefore, it is meaningless to talk of molecularity of the
overall complex reaction.
On the other hand, order of complex
reaction depends upon the molecularity of the slowest
step. Hence, it is not
meaningless to talk of the order of a complex reaction.
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