Which of the following statement(s) is/are correct ?
I. Zero order reactions are complex reactions.
II. A reaction, having first order may be either elementary or complex reaction.
III. A reaction, having second order reaction must have molecularity = 2.
IV. A reaction with molecularity = 2 must be a second order reaction.

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I & II

I, II, III, & IV

I & III

II & IV

answer is A.

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Detailed Solution

I. Zero order reactions are complex reactions.

II. A reaction having first order may be either elementary or complex reaction.

III. A reaction having second order reaction may or may not have molecularity = 2. Only elementary bimolecular reactions have second order reaction.

IV. A reaction with molecularity = 2 may be a second order reaction.

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