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COMEDK2017ChemistryGeneral Organic Chemistry

Which of the following species does not exert a resonance effect?

Options

  1. AC ₆ H ₅ NH ₂
  2. BC ₆ H ₅ ⁺ NH ₃
  3. CC ₆ H ₅ OH
  4. DC ₆ H ₅ Cl

Correct answer

B. C ₆ H ₅ ⁺ NH ₃

Step-by-step solution

C ₆ H ₅+ NH ₃ does not exert a resonance effect because all the electron pairs of nitrogen are involved in bond formation. Hence, no lone pair is present on nitrogen for resonance.

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