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JEE Advanced2008ChemistryGeneral Organic ChemistryActual

The correct stability order for the following species is

Options

  1. A(II) > (IV) > (I) > (III)
  2. B(I) > (II) > (III) > (IV)
  3. C(II) > (I) > (IV) > (III)
  4. D(I) > (III) > (II) > (IV)

Correct answer

D. (I) > (III) > (II) > (IV)

Step-by-step solution

I > III > II > IV +M -effect, hyperconjugation (6 Hs ) and + I-effect (2 Me groups) +M -effect, hyperconjugation ( 3 Hs ) and +I -effect (1 Me group) 2^ carbocation) ⁺ Hyperconjugation (5Hs) and +I-effect Hyperconjugation (2Hs) and +I effect

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