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JEE Main202116 Mar 2021Evening ShiftChemistryAminesActual

Which of the following is least basic?

Options

  1. ACH 3 CO N ¨ HC 2 H 5
  2. BC 2 H 5 3 N ¨
  3. CCH 3 CO 2 N ¨ H
  4. DC 2 H 5 2 N ¨ H

Correct answer

C. CH 3 CO 2 N ¨ H

Step-by-step solution

For the given compounds: (1) ; L . P . on Nitrogen is delocalised. (2) ; L . P . on Nitrogen is localised. (3) ; L . P . on Nitrogen is delocalised due to conjugation with both (Hence least basic) (4) CH 3 - CH 2 - N ¨ H - CH 2 - CH 3 ; L . P . on Nitrogen is localised.

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