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The correct order of basic nature in aqueous solution for the bases NH 3 , H 2 N – NH 2 , CH 3 CH 2 NH 2 , (CH 3 CH 2 ) 2 NH and (CH 3 CH 2 ) 3 N is :

1. NH 3 < H 2 N – NH 2 < (CH 3 CH 2 ) 3 N < CH 3 CH 2 NH 2 < (CH 3 CH 2 ) 2 NH
2. NH 3 < H 2 N – NH 2 < CH 3 CH 2 NH 2 < (CH 3 CH 2 ) 2 NH < (CH 3 CH 2 ) 3 N
3. NH 2 – NH 2 < NH 3 < CH 3 CH 2 NH 2 < (CH 3 CH 2 ) 3 N < (CH 3 CH 2 ) 2 NH
4. H 2 N – NH 2 < NH 3 < (CH 3 CH 2 ) 3 N < CH 3 CH 2 NH 2 < (CH 3 CH 2 ) 2 NH

Correct answer: NH 2 – NH 2 < NH 3 < CH 3 CH 2 NH 2 < (CH 3 CH 2 ) 3 N < (CH 3 CH 2 ) 2 NH

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