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1.4 Lone Pairs
The first structure is aromatic.
The second structure is also aromatic.
Pyrrole has six p electrons, two from the lone pair and two from each of the p bonds.
The compound is aromatic because the criteria for aromaticity have been satisfied.
The lone pair is part of the aromatic system.
The ring would lose its aromaticity.
The nitrogen atom is uphill in energy and not observed.
The lone pair is not part of the aromatic system.
The aromatic system is not being contributed to by 2 hybridized orbitals.
pyridine is used as a mild base in many reactions.
Let's look at an example of an aromatic compound.
For the same reason that pyrrole is aromatic, furan is also aromatic.
When we are counting to see if we have a Huckel number, we only count one of the lone pairs of the oxygen atom.
One of the compounds is aromatic.
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