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JEE Main Chemistry question

ChemistryOrganic Chemistry - Some Basic Principles and TechniquesJEE Main

Considering the relative stability of the carbanions shown — (1) a simple vinylic carbanion R₂C=CH⁻; (2) a cyclic, fully delocalised (cyclopentadienyl-type, aromatic) carbanion; (3) a differently-substituted vinylic carbanion; (4) a simple sp³ alkyl carbanion R₃C–CH₂⁻ — the correct stability order is

Answer: (A)

Solution

The cyclic carbanion (2) is aromatically stabilised by full delocalisation of its negative charge over the ring (6π, Hückel-aromatic), making it by far the most stable. Among the remaining,

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Question ID VK-139998