Question
For which type of reactions, order and molecularity have the same value?

Answer

Elementary reactions have same value of order and molecularity.
Elementary reaction is chemical reaction in which one or more reactants racts directly to form product in a single step with single transition state.
Example:
$\text{A + B}\xrightarrow{\ \ \ \ \ }\text{Products}$
Rate equation: $[A]^1[B]^1$ Order of reaction is sum of the cofficients of rate equation.
$\therefore$ Order of reaction $= 2$ Molecularity $= 2$

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