MCQ
The correct order of basic nature on aqueous solution for the bases $NH _3, H _2 N- NH _2, CH _3 CH _2 NH _2$, $\left( CH _3 CH _2\right)_2 NH$ and $\left( CH _3 CH _2\right)_3 N$ is :
  • A
    $NH _3< H _2 N- NH _2<\left( CH _3 CH _2\right)_3 N< CH _3 CH _2 NH _2<$ $\left( CH _3 CH _2\right)_2 NH$
  • B
    $NH _3< H _2 N- NH _2< CH _3 CH _2 NH _2<\left( CH _3 CH _2\right)_2 NH <$ $\left( CH _3 CH _2\right)_3 N$
  • C
    $H _2 N- NH _2< NH _3<\left( CH _3 CH _2\right)_3 N< CH _3 CH _2 NH _2<$ $\left( CH _3 CH _2\right)_2 NH$
  • $NH _2- NH _2< NH _3< CH _3 CH _2 NH _2<\left( CH _3 CH _2\right)_3 N<$ $\left( CH _3 CH _2\right)_2 NH$

Answer

Correct option: D.
$NH _2- NH _2< NH _3< CH _3 CH _2 NH _2<\left( CH _3 CH _2\right)_3 N<$ $\left( CH _3 CH _2\right)_2 NH$
(D) $NH _2- NH _2< NH _3< CH _3 CH _2 NH _2<\left( CH _3 CH _2\right)_3 N<$ $\left( CH _3 CH _2\right)_2 NH$
Explanation: Basic strength of amine depends on hydrogen bonding and electronic inductive effect.
$NH ( Et )_2> N ( Et )_3> NH _2 Et >\ddot{ N }_3> NH _2- NH _2$

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