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  4. Which of the following is aromatic compounds?

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Q. Which of the following is aromatic compounds?

AMUAMU 2016Hydrocarbons

Solution:

According to Huckel’s rule for aromaticity, planar monocyclic rings containing $(4n + 2)n$ electrons (where $n = 0, 1,2,3$ and so on) should be aromatic. Another requirement for aromaticity is planarity of the ring. In the given compounds, all contains $6n$ electrons, therefore for them, $n$ comes out be $1$,hence, pyrrole, thiophene and furan are all aromatic.
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