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JEE Main Chemistry question

ChemistryAromatic Compounds and Aryl HalidesJEE Main

Which of the following species could be expected to exhibit aromatic character? Select from: (I) cyclopentadienyl anion, (II) cyclopentadienyl cation, (III) cycloheptatrienyl (tropylium) cation, (IV) cyclopentadiene (neutral). [J & K CET 2003]

Answer: (C)

Solution

Aromaticity (Hückel's rule) requires a cyclic, planar, fully conjugated system with -electrons. The cyclopentadienyl anion has 6 -electrons () — aromatic. The cyclopentadienyl cation has only 4 -electrons — antiaromatic. The

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Question ID VK-142256