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Arrange the following in decreasing orde...

Arrange the following in decreasing order of their basic strength :
`C_(6)H_(5)NH_(2),C_(2)H_(5)NH_(2),(C_(2)H_(5))_(2)NH_(3)`

Text Solution

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Due to +I-effect of the alkyl groups, `(C_(2)H_(5))_(2)NH` is a stronger base than `C_(2)H_(5)NH_(2)` and both of these are stronger bases than `NH_(3)`. However, due to delocalization of lone pair of electrons present on nitrogen ver the benzene ring, `C_(6)H_(5)NH_(2)` is a weaker base than aliphatic amines and ammonia. Thus, the basic strength of the given amines decreases in the order:
`(C_(2)H_(5))_(2)NH gt C_(2)H_(5)NH_(2) gt NH_(3) gt C_(6)H_(5)NH_(2)`.
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