1thanx subhomoy
in aromaticity it is required condition that there is at least one unhybridised p-orbital.what does it mean?
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3 Answers
1means there should some pi electrons or lone pairs available for resonance..
49in aromaticity it is required that ONE P ORBITAL PER CARBON ATOM is unhybridised.
this requires that each carbon atom is sp2 hybridised and this ensures the molecule has a planar structure..
this ensures that the unhybridised p orbital is projecting perpendicularly above and below the surface of the molecule ensuring an electron cloud which can potentially make π bonds.
now if the no of "unhybridised p" electrons has a number equal to 4n+2 {n ε Z}i.e. in all an odd number of pi bonds can be made in one of the resonating structures :D then the molecule will become aromatic.
the number 4n+2 ensures that there is continuous conjugation throughout the molecule as we move along C-C bongs "along any path" [actually this is the required condition of aromaticity]