Resonance energy per benzene ring decreases in the order

Naphthalene > benzene > Anthracene > Phenanthrene

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Benzene > Nephthalene > Anthracene > Phenanthrene

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Benzene > Naphthalene > Phenanthrene > Anthracene

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All have equal resonance energy

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Solution

The correct option is C Benzene > Naphthalene > Phenanthrene > Anthracene
Resonance energy per ring decreases with increase in no. of rings
$∴$ Benzene > Napthalene > Phenonthrene > Anthracene
No of resonance structures of phenanthrene < anthracene. Therefore resonance energy will be less

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