For a reaction mechanism with multiple steps, which of the following is not true about the individual steps?

Elementary steps in a multi-step reaction mechanism may be either slow or fast.

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Fast elementary steps in a multi-step mechanism reach equilibrium quickly.

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Fast elementary steps before the rate-determining step may contain an intermediate.

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Fast elementary steps after the rate-determining step may have an effect on the overall rate law.

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Solution

The correct option is A Elementary steps in a multi-step reaction mechanism may be either slow or fast.
$\to$ Elementary step is a single step reaction, with no experimentally detectable reaction intermediate.

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