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AP EAMCET202018 Sep 2020Evening ShiftChemistryGeneral Organic ChemistryActual

Arrange the following carbocations in the increasing order of stability with respect to their labels. ( array c|c Label & Carbocation 1 & ( CH ₃ )₂ CH ⁺ 2 & CH ₃⁺ 3 & ( CH ₃ )₃ C ⁺ 4 & CH ₃- CH ₂⁺ array )

Options

  1. A(2 < 4 < 1 < 3 )
  2. B(1 < 2 < 3 < 4 )
  3. C(4 < 3 < 2 < 1 )
  4. D(2 < 4 < 3 < 1 )

Correct answer

A. (2 < 4 < 1 < 3 )

Step-by-step solution

Stability of carbocation ( ) number of hyperconjugative structure ( ) number of ( - H ) atoms (1) ( C H ₃- C H - C H ₃ ), Hyperconjugative structure (=6 ) (2) ( C H ₃ ), Hyperconjugative structure (=0 ) (3) Hyperconjugative structure (=9 ) (4) ( C H ₃- C H ₂ ), Hyperconjugative structure (=3 ) So, stability of carbocations (2 < 4 < 1 < 3 ) (option a).

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