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Organic Chemistry

Blazing goIITian

Joined:	19 Aug 2007
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26 Oct 2007 06:59:03 IST

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643

aromatic compounds

None

what are the criteria for an org. comp. to be aromatic.(other than, it has a aroma).

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arun-rashi

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26 Oct 2007 07:20:26 IST

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for a compound to be aromatic it must be1cyclic and planar with sp2 hybridisation 2.high resonance energy 3.electrophilic substitution reaction 4 obey (4n +2)

electron rule where n=0,1,2,3 etc so follow above condition simultaneously 2pi,6pi,10pi etc cyclic planar structure are aromatic in nature.

arun-rashi

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26 Oct 2007 07:24:06 IST

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for example cyclopropene is 2pi electron system but not aromatic because one carbon is sp3 and resonance is also absent but cyclopropenyl cation is aromatic because it satisfy all condition.similarlt benzene is 6pi aromatic,nepthalene is 10pi aromatic while anthrasene is 14pi aromatic system.

arun-rashi

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26 Oct 2007 07:26:24 IST

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if we consider some hetrocyclic aromatic compound like pyridine,pyrrole,furan and thiophene these all are 6

electron system with all aromatic property.

MoNaLisA :):):)

Scorching goIITian

Joined: 25 Oct 2007

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26 Oct 2007 15:21:57 IST

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conditns 4 a compd 2 show aromaticity

(a) huckels rule must b followed [ i.e. (4n+2)pi rule]

(b) compds sud b cyclic n planar

aNdRoMeDa

Blazing goIITian

Joined: 10 Sep 2007

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26 Oct 2007 16:06:13 IST

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aromatic comp....contain higher % of carbon in their molecule.....

they burn wid a sooty......... .smoky flame.........

they contain closed chain compounds..containin atleast one benzene ring,....wid conjugate system of single & double bond........

they r highly stable...........

they do not undergo.....addition rxtion easily........

but undergo.....substitution rxtion more readily........................

their hydroxy derivatives r acidic in nature............

.......

hope it helps u............... :)

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