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JEE Advanced levelSingle correct optionDifficulty 3 of 3g1021

Arrange in increasing order of basic strength in water: (P) , (Q) , (R) .

  1. AP < R < Q
  2. BR < Q < P
  3. CP < Q < R
  4. DQ < P < R

Answer: C

The group withdraws electrons from the nitrogen lone pair and reduces basicity. The effect is largest when is nearer to N (P), smaller when one more carbon intervenes (Q), and absent in ethylamine (R). So P < Q < R.
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