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Can an intermediate appear as a reactant in the first step of a reaction mechanism?

Question

Can an intermediate appear as a reactant in the first step of a reaction mechanism?

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Solution

No, an intermediate cannot appear as a reactant in the first step of a reaction mechanism. Here's why:

  1. By definition, an intermediate is a species that is formed during the reaction but is not present in the overall reaction. It is produced in one step and consumed in a subsequent step, hence the term 'intermediate'.

  2. In the first step of a reaction mechanism, only the reactants that are present in the overall reaction can be involved. These reactants get converted into products or intermediates.

  3. Since an intermediate is produced in the reaction process, it cannot be present before the reaction has started, which means it cannot be a reactant in the first step.

  4. If an intermediate were to appear as a reactant in the first step, it would imply that it was present before the reaction started, which contradicts the definition of an intermediate.

So, in conclusion, an intermediate cannot appear as a reactant in the first step of a reaction mechanism.

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