(B) The order of a reaction with respect to a reactant is defined by the exponent of its concentration term in the rate law expression.For a reaction

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The rate of the reaction is proportional to $[X]^2$

(B) The order of a reaction with respect to a reactant is defined by the exponent of its concentration term in the rate law expression.For a reaction $r = k[X]^n$,if the order with respect to $X$ is $2$,then $n = 2$.Therefore,the rate of the reaction is proportional to $[X]^2$,i.e.,$r \propto [X]^2$.

Class 12 Chemistry Chemical Kinetics Rate law , Rate constant , Order of Reaction and Molecularity

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The order of a reaction is said to be $2$ with respect to a reactant $X$,when

A
The rate of the reaction is proportional to $[X]$
B
The rate of the reaction is proportional to $[X]^2$
C
Two molecules of $X$ are present in the stoichiometric equation
D
The reaction occurs in two steps

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Chemical Kinetics

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Rate law , Rate constant , Order of Reaction and Molecularity

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The order of a reaction is said to be $2$ with respect to a reactant $X$,when

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