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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3g1165

Which of the following statements are correct?

  1. AAntiaromatic compounds are less stable than comparable open-chain conjugated analogues.
  2. BCyclobutadiene has 4 pi electrons, i.e. with .
  3. CAromaticity requires a planar ring with cyclic overlap of p orbitals.
  4. DHuckel's rule counts the sigma electrons of the ring.

Answer: A, B, C

Antiaromatic systems are destabilised by cyclic delocalisation of pi electrons; cyclobutadiene is the standard example. Planarity with continuous p-orbital overlap is a requirement. Huckel's rule counts pi electrons, not sigma electrons, so the last statement is false.
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