Which of the following statements regarding the E2 mechanism is wrong?

Reactions by the E2 mechanism are always bimolecular.

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Reactions by the E2 mechanism are generally second order.

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Reactions by the E2 mechanism usually occur in one step.

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Reactions by the E2 mechanism usually occur in two steps.

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Solution

The correct option is D Reactions by the E2 mechanism usually occur in two steps.
E2 is a bimolecular reaction. It is a single step reaction goes through a single transition state. It is a concerted reaction. In E2 reaction, two groups/atoms depart simultaneously from adjacent carbons with a proton being abstracted by a base. Thus option d is wrong as E2 is a single step reaction.

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