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MCQMediumJEE Main 2026 · 21 January, Shift 1Electronic Effects (Inductive, Resonance, Hyperconjugation)

Chemistry Question from JEE Main 2026 · 21 January, Shift 1

From the following, the least stable structure is:

(Assume standard resonance structures)

  • A
    Resonance structure showing a conjugated carbon chain attached to a positively charged nitrogen with two oxygens, both oxygens negatively charged, and a positive charge at the left end.
  • B
    Resonance structure showing an allylic carbon cation in the chain attached to nitrogen, with nitrogen positively charged, one oxygen double bonded and one oxygen negatively charged.
  • C
    Resonance structure showing adjacent positive charges on carbon and nitrogen, a negative charge on a nearby carbon, and one oxygen double bonded with one oxygen negatively charged.
  • D
    Resonance structure showing a negative charge on the left carbon, a positive charge on the adjacent terminal carbon, conjugation toward a positively charged nitrogen, and one oxygen negatively charged.

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