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Question

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.

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