Grade 12Organic Chemistry
Which benzoids have highest resonance energy?Benzene, naphthalene, anthracene, phenanthrene
Which benzoids have highest resonance energy?
Benzene, naphthalene, anthracene, phenanthrene
2 Answers
Phenanthrene has the highest resonance energy among the given benzanoids i.e among benzene, naphthalein, anthracene, and phenanthrene
Dear student
The resonance energy for phenanthrene is 92 Kcal/mol, that for anthracene is 84 Kcal/mol and for naphthalene and benzene rings are 61 and 36 Kcal/mol respectively.
Here resonance energy per benzene ring decreases from 36 Kcal/mol for benzene to 30.5 Kcal/mol for naphthalene, 30.3 Kcal/mol for phenanthene and 28 Kcal/mol for anthracene.
Here resonance energy per benzene ring decreases from 36 Kcal/mol for benzene to 30.5 Kcal/mol for naphthalene, 30.3 Kcal/mol for phenanthene and 28 Kcal/mol for anthracene.
Hence, order of stability (or RE): Benzene > Phenanthrene ~ Naphthalene > Anthracene. In fact other fused polycyclic aromatic hydrocarbons react faster than benzene.
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