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Both have similar resonance energy per ring, even Naphthalene has a little higher Resonance energy (127.5 KJ per mol per ring v/s 127 KJ per mol per ring )

Can we prove , why there is a small difference between them and Anthracene has lower resonance energy ?

Is there significant difference in their reactivity ?

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    $\begingroup$ In naphthalene, both rings are similar. In anthracene, the middle one is significantly different ("less aromatic") from the other two, hence the reactivity. $\endgroup$
    – Ivan Neretin
    Commented Feb 2, 2017 at 12:12

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