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# What are elementary reactions involving two reactants called?

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## Elementary reactionsA single-step reaction is known as an elementary reaction.The elementary reaction is divided into unimolecular, bimolecular, and termolecular.Bimolecular reactionThe elementary reactions in which two reactants participate are called bimolecular reactions.An example of a bimolecular reaction is as follows:- $\mathrm{A}+\mathrm{A}\to \mathrm{P}\phantom{\rule{0ex}{0ex}}\mathrm{A}+\mathrm{B}\to \mathrm{P}$In the first reaction, two reactants(A, A) are involved and in the second reaction, two reactants (A, B) are involved in the formation of product(P). So, this reaction is a bimolecular reaction. ${\mathrm{SN}}_{2}$ is a bimolecular reaction whose rate depends on the concentration of alkyl halide and the concentration of nucleophile,Hence, bimolecular reactions are elementary reactions involving two reactants.

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