For a complex reaction :

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order of overall reaction is same as molecularity of the slowest step (provided slowest step is having no reaction intermediate).

order of overall reaction is less than the molecularity of the slowest step.

order of overall reaction is greater than molecularity of the slowest step.

molecularity of the slowest step is never zero or non integer.

answer is A, D.

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Detailed Solution

Order of the overall reaction for a complex reaction equals the slowset step's molecular weight. Because the total number of molecules involved in the reaction's slowest stage affects the reaction's overall rate. As a result, the order of the total reaction equals the molecularity of the slowest step.
Because a reaction cannot be completed in the absence of reactants, Therefore, at least one reactant must be present in the first stage of any chemical reaction. As a result, the slowest step's molecularity is never zero or non-integer.

Hence, options A and D are correct.

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