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NEET2013ChemistryGeneral Organic ChemistryActual

Homolytic fission of the following alkanes forms free radicals CH ₃- CH ₃ , CH ₃- CH ₂- CH ₃, ( CH ₃ )₂ CH - CH ₃ , CH ₃- CH ₂- CH ( CH ₃ )₂ . Increasing orders of stability of the radicals is:

Options

  1. A( CH ₃ )₂ C - CH ₂ CH ₃ < CH ₃- CH - CH ₃ < CH ₃- CH ₂ < ( CH ₃ )₃ C
  2. BCH ₃- CH ₂ < CH ₃- CH - CH ₃ < ( CH ₃ )₂ C - CH ₂- CH ₃ ( CH ₃ )₃ C
  3. CCH ₃- CH ₂ < CH ₃- C H - CH ₃ < ( CH ₃ )₃ C < ( CH ₃ )₂ C - CH ₂ CH ₃
  4. D( CH ₃ )₃ C < ( CH ₃ )₂ C - CH ₂ CH ₃ < CH ₃- CH - CH ₃ < CH ₃- C H ₂

Correct answer

B. CH ₃- CH ₂ < CH ₃- CH - CH ₃ < ( CH ₃ )₂ C - CH ₂- CH ₃ ( CH ₃ )₃ C

Step-by-step solution

One of the factor that determines the stability of radicals is hyper conjugation. ( CH ₃ )₃ C show the maximum hyperconjugation.

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