The ring systems having following characteristics are aromatic.
1. Planar ring containing conjugated bonds.
2. Complete delocalisation of the -electrons in ring system i.e., each atom in the ring has unhybridised p-orbital, and
3. Presence of -electrons in the ring where n is an integer (n=0,1,2,...) [Huckel rule].
Using this information classify the following compounds as aromatic/non-aromatic.
|
Compound |
Planar Ring |
Complete delocalization of -electron |
Huckel rule electron |
Aromatic or non-aromatic |
A. |
Yes |
Yes |
Huckel rule obeyed |
Aromatic |
|
B. |
No |
No, Incomplete (sp3 hybrid carbon) |
Non-aromatic |
||
C. |
Yes |
Yes |
(4n+2+lone pair e-) Huckel rule verified |
Aromatic |
|
D. |
Yes |
No |
Anti-aromatic |
||
E. |
Yes |
Yes |
Huckel rule obeyed |
Aromatic |
|
F. |
Yes |
Yes |
Huckel rule verified n=0 |
Aromatic |
|
G. |
Yes |
No |
Huckel rule not verified |
Non-aromatic |
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