AROMATICITY CHEMISTRY

1.AROMATICITY   

1 Cyclic

2 conjugated   ( electron delocolised in ring are called conjugation) 

3 planar ( 2D ) [corbon=sp2]

4 (4n+2)pi electron  (2pi electron, 6pi electron, 10pi electron) 

Huckel rule =

The Huckel 4n + 2 Pi Electron Rule

A ring-shaped cyclic molecule is said to follow the Huckel rule when the total number of pi electrons belonging to the molecule can be equated to the formula '4n + 2' where n can be any integer with a positive value (including zero).

2. ANTI-AROMATIC

1 cyclic

2 conjugated

3 planner

4 4n pi electron (4pi electron, 8pi electron, 12pi electron) 

3 NON-AROMATC

 Compound which are neither- aromatic , nor anti - aromatic are called non - aromatic. 

4 HOMO - AROMATIC 

1 Cyclic

2 conjugated

3 no  planner (sp3 = hybridization )                                        

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