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NEET2011ChemistryGeneral Organic ChemistryActual

The correct decreasing order of p K_b is

Options

  1. AI > II > III > IV
  2. BIII > IV > II > I
  3. CII > III > IV > I
  4. DIV > II > I > III

Correct answer

D. IV > II > I > III

Step-by-step solution

Substituent with strong +R effect, +I effect and weaker -I effect increases the basicity. Hence p K_b decreases. Also, alkylamines are stronger bases than arylamines. So, the order is (4).

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