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Collision Theory

Which of the ...

Question

Which of the following is correct regarding the chemical species corresponding to location I, II and III on the given reaction coordinate diagram.

A

I

and

I I I

represents activated complex

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B

I

represents activated complex and

I I I

is reaction intermediate

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C

I

and

I I

represents activated complex

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D

I, I I and I I I

represents activated complex

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Solution

The correct option is A $I$ and $I I I$ represents activated complex
Complex reaction consists of multiple steps. Every step behaves as an elementary reaction. So each step has its own molecularity.
$R e a c t a n t \to I n t e r m e d i a t e \to P r o d u c t$

In the given graph Point (I) and (III) are the transition states. The unstable complex at the transition state is called activated complex or Transition-state complex.
Point (II) represent the stable intermediate of the reaction.

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