JEE Main Chemistry question

**Assertion:** Molecularity has no meaning for a complex reaction.

**Reason:** The overall molecularity of a complex reaction is equal to the molecularity of the slowest step.

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for AssertionCorrect
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (B)

Solution

Molecularity, strictly defined as the number of reacting species coming together in a single step, is meaningful only for an elementary reaction — a complex (multi-step) reaction does not occur in one single step, so a genuine overall molecularity cannot be assigned to it; the Assertion is true. The Reason — that

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Question ID VK-144370