JEE Main Chemistry question
How many of a given set of ring structures (including a cyclopentadienyl-type cation, cyclooctatetraene, cyclopropenyl-type species, cyclopentane, a furan-type ring, a cycloheptatrienyl-type species, and a pyrrole-type ring) show aromatic behaviour?
Answer: 3
Solution
Applying Hückel's rule (planar, cyclic, fully conjugated, with -electrons) to each structure: the cyclopropenyl cation (2 e, ) and the furan-type and pyrrole-type rings (each 6 e, drawing on the heteroatom's lone pair) satisfy Hückel's rule and are aromatic. The cyclopentadienyl
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