Statement I: The formation of the arenium ion (sigma complex) is the rate-determining step in general electrophilic aromatic substitution. Statement II: The formation of the arenium ion is an exotherm

Question

Statement I: The formation of the arenium ion (sigma complex) is the rate-determining step in general electrophilic aromatic substitution. Statement II: The formation of the arenium ion is an exothermic process because it gains resonance stabilization.

Prashant Kotian · Accepted Answer

Correct answer: C. Statement I is true; the formation of the arenium ion is the slow, rate-determining step. Statement II is false; this step is highly endothermic because it destroys the stable aromatic sextet, creating an carbon.

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