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BITSAT2017ChemistryAminesActual

The most reactive amine towards reactions with dil. HCl is

Options

  1. ACH 3 - NH 2
  2. B( CH 3 ) 2 NH
  3. CCH 3 3 · N
  4. DPhNH 2

Correct answer

B. ( CH 3 ) 2 NH

Step-by-step solution

More be the ability of N -atom of - NH 2 group to donate lone pair of electrons to HCl (dil.), more be the reactivity of amine. In (B) two alkyl groups are attached to the - NH 2 (having electron releasing nature) which increases the electron donating ability of N -atom of - NH 2 . In aqueous medium, secondary amine is most basic. Hence, it is most reactive. In (D), due to resonance, lone pair of electrons get delocalised and its basic strength is very less.

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