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What is the aromatic compound?

What is the aromatic compound?

Grade:10

2 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
10 years ago
the criteria for the compound to be aromatic are
(1)ring is planar
(2)there is complete delocalisation of pi electron which is only possible if it is conjugated system
(3)no of electron used in delocalisation is 4n+2 it can be lone pair also
ex-benzeneC6H6 no of pi electron=6 (4n+2)
1,3 is non aromatic pi elctron=4

thanks and regards
sunil kr
askIItian faculty
Raheema Javed
156 Points
9 years ago
Aromatic compounds, also known asarenesoraromatics, arechemicalcompounds that containconjugatedplanar ring systems with delocalisedpi electronclouds instead of discrete alternatingsingleanddouble bonds. Typical aromatic compounds arebenzeneandtoluene. They should satisfyHückel's rule.Inorganic chemistry,Hückel's ruleestimates whether aplanarringmoleculewill havearomaticproperties.Acyclicring molecule followsHückel's rulewhen the number of itsπ-electronsequals 4n+2 wherenis zero or any positiveinteger, although clearcut examples are really only established for values ofn= 0 up to aboutn= 6

Aromatic compounds are more stable than theoretically predicted by alkene hydrogenation data; the "extra" stability is due to the delocalized cloud of electrons, called resonance energy. Criteria for simple aromatics are:

the molecule must follow Huckel's rule, having 4n+2 electrons in the delocalized, conjugated p-orbital cloud;
the molecule must be able to be planar;
the molecule must be cyclic; and,
every atom in the ring must be able to participate in delocalizing the electrons by having a p-orbital or an unshared pair of electrons.

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