|#||Molecularity Of Reaction||Order of Reaction|
|1||Molecularity is the number of reacting species which undergo simultaneous collisions in the elementary or simple reactions.||It is the sum of powers of the concentrations terms in the rate law equation.|
|2||It is a theoretical concept.||It can be determined experimentally.|
|3||It is always a whole number.||It can be whole number as well as fraction.|
|4||It can never be zero.||It can be zero.|
|5||It has no significance for a complex reaction and can be expressed for each elementary step in case of a complex reaction.||It is always the same for the overall reaction whether the reaction is complex or simple.|
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