Which of the following is the correct order for the stability of anthracene and phenanthrene?
A
Anthracene > Phenanthrene
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B
Anthracene < Phenanthrene
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C
Anthracene ≈ Phenanthrene
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D
Cannot be predicted
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Solution
The correct option is A Anthracene > Phenanthrene According to Fries' rule, the most stable form of the bonds of a polycyclic compound is that arrangement which has the maximum number of rings in the benzenoid form.
Number of benzenoid forms in anthracene = 6
Number of benzenoid forms in phenanthrene = 10
Since phenanthrene has more number of benzenoid rings than anthracene, hence according to Fries' rule, phenanthrene is more stable than anthracene.