In the electrophilic aromatic substitution of naphthalene at the (C-1) position, how many major resonance structures can be drawn for the intermediate arenium ion that maintain a fully intact, complet

Question

In the electrophilic aromatic substitution of naphthalene at the $\alpha$ (C-1) position, how many major resonance structures can be drawn for the intermediate arenium ion that maintain a fully intact, completely conjugated benzenoid ring?

Prashant Kotian · Accepted Answer

Correct answer: 2. When an electrophile attacks naphthalene at the C-1 () position, the positive charge is delocalized within the attacked ring. Exactly 2 of the resulting resonance structures allow the adjacent ring to remain a fully conjugated, intact benzenoid ring. This significantly lowers the energy of the transition state compared to -attack, which only has 1 such intact benzenoid structure.

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