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The order of basicity of the compounds is

Options

  1. AIV > I > III > II
  2. BI > III > II > IV
  3. CIII > I > IV > II
  4. DII > I > III > IV

Correct answer

B. I > III > II > IV

Step-by-step solution

The order of basicity is I > III > II > IV The lone pair of electrons on N is more readily available for protonation in I and III then in II. III contains an oxygen atom which has - I effect due to which it is less basic than I. In compound IV lone pair of e ⁻ s on N -atom is contributed towards the aromatic sextet formation and hence is not at all available for protonation. Hence option (b) is correct.

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