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JEE Main levelSingle correct optionDifficulty 2 of 3g1141

Assertion (A): The cyclopentadienyl anion is aromatic. Reason (R): It is planar, cyclic, fully conjugated and has 6 pi electrons.

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion
  3. CAssertion is true but Reason is false
  4. DAssertion is false but Reason is true

Answer: A

The anion has five sp2 carbons in a planar ring with 4 pi electrons from two C=C and 2 from the carbanion lone pair, giving 6 pi electrons (, ). The Reason states exactly the conditions for aromaticity, so it explains the Assertion.
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