The order of stability of the aromatic hydroc | vedclass

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Question

(A) The stability of polycyclic aromatic hydrocarbons is determined by the resonance energy per ring. Benzene $(A)$: $36 \ kcal/mol$ per ring. Naphtha

Vedclass · Accepted Answer

$C < B < D < A$

Vedclass · Answer

(A) The stability of polycyclic aromatic hydrocarbons is determined by the resonance energy per ring. Benzene $(A)$: $36 \ kcal/mol$ per ring. Naphthalene $(B)$: $61 \ kcal/mol$ for $2$ rings,so $61/2 = 30.5 \ kcal/mol$ per ring. Anthracene $(C)$: $84 \ kcal/mol$ for $3$ rings,so $84/3 = 28 \ kcal/mol$ per ring. Phenanthrene $(D)$: $92 \ kcal/mol$ for $3$ rings,so $92/3 = 30.67 \ kcal/mol$ per ring. Comparing the values: $28 (C) Therefore,the order of stability is $C < B < D < A$.

The order of stability of the aromatic hydrocarbons given below is:

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