poly hydrocarbon.pptx - POLY AROMATIC HYDROCARBON S...

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POLY AROMATICHYDROCARBONS
IsolatedLinearBenzenoidNon- BenzenoidFused ringsAngularPoly-nuclear aromatic hydrocarbons are composedby two or more benzene ringsPolynuclear Hydrocarbons
21665Benzenoid:Similar to benzene in structure orlinkage; having an aromatic ring system.Fused or condensed ring system:Whentwo rings share a pair of carbon atoms, therings are said to be fused rings.Isolated ringBiphenyl or diphenylom35om4po21mom3p4
NAPTHALENE(C10H8)Shows aromatic propertiesSatisfy Huckel’s rule (4n+2)=(4*2+2)=10
All C=C are not same (X-ray diffraction study)C1=C2=1.36 ÅC2=C3=1.40 ÅResonance energy of naphthalene is 61 Kcal/molBenzene, 36 Kcal/mol2ndaromaticringislessstable(61-36)=25Kcal/molNaphthalene is less aromatic (more reactive) thanbenzene because it has less resonance stabilizingenergyascomparedto2individualbenzenemolecules.
Naphthalenecontains two benzeneringsand we can explain this by this equation
Reduction
Oxidation
Addition of Cl2/ Br2

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Term
Spring
Professor
Ali Zainal
Tags
Benzene, anthracene, C1

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