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Roni posted an Question
November 10, 2020 • 21:22 pm 30 points
  • IIT JAM
  • Chemistry (CY)

35 goc please ans my following questions as soon as possible

2 Answer(s) Answer Now
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  • Suman Kumar

    option A is correctResonance energy per ring decreases with increase in no. of rings ∴ Benzene > Napthalene > Phenonthrene > Anthracene

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    Priyanshu kumar best-answer

    Resonance energy per ring decreases with increase in no. of rings ∴ Benzene > Napthalene > Phenonthrene > Anthracene Option A is correct In Normal way...more the no of benzene ring more is the resonance energy...but for stability we check resonance energy per benzene ring

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    Dinesh khalmaniya 1 Best Answer

    option A Explanation- Resonance energy per ring decreases with increase in no. of rings. Stability can be compared only for isomeric or related compounds or at best for unsaturated hydrocarbons it is compared only when they give same hydrogenated products. However, for polycyclic aromatic hydrocarbons, stability can be said to be proportional to resonance energy per benzene rings. 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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