Aromatic HydrocarbonsMedium
Question
The total number of aromatic compounds/species from the following is 
Options
A.6
B.4
C.3
D.5
Solution
Sol. [Key Concept: Apply Huckel's $(4n + 2)\pi$ rule to each species: the tropylium cation, phenanthrene, the naphthalene-type ring and the cyclobutadiene dication are aromatic, giving $4$ aromatic compounds.]
Aromatic compounds are
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