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      Question

      The false statements among the following are: I.

      A primary carbocation is less stable than a tertiary carbocation. II. A cyclopropyl methyl carbocation is less stable than allyl carbocation. III. A tertiary free radical is more stable than a primary free radical. IV. Isopropyl carbanion is more stable than ethyl carbanion.
      A I and II Correct Answer Incorrect Answer
      B II and III Correct Answer Incorrect Answer
      C I and IV Correct Answer Incorrect Answer
      D II and IV Correct Answer Incorrect Answer

      Solution

      Since cyclopropyl methyl carbocation (dancing resonance) is exceptionally more stable than allyl carbocation and ethyl carbanion is more stable than isopropyl carbanion. Rest other statements are correct. Tertiary free radical is more stable than a primary free radical due to + I  effect of three methane. Same is the case with carbocations.

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