JEE Main Chemistry question
How many of the following four species/molecules are aromatic in character: (1) the cyclopentadienyl cation, (2) the cycloheptatrienyl (tropylium) cation, (3) the cyclopropenyl cation, (4) azulene?
Answer: 3
Solution
The cyclopentadienyl cation has 4 π-electrons (4n, n = 1) and is anti-aromatic, not aromatic. The tropylium cation (6 π-electrons, 4n+2 with n = 1), the
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