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The number of molecules of the reactants...

The number of molecules of the reactants taking part in a single step of the reaction tells about. :

A

molecularity of the reaction

B

mechanism of the reaction

C

order of reaction

D

all

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It is the definition of molecularity .
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Assertion (A) : The molecularity of a reaction may be a fraction Reason (R) : The molecularity of a reaction is the number of molecules whether of the same or different species that must contact simultaneously in a single step for the reaction to occur.

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