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Arrange in order of decreasing basic str...

Arrange in order of decreasing basic strenght and show reasons `CH_(3)-CH=overset(* *)(N)H,CH_(3)-C-=overset(* *)(N),CH_(3)-overset(* *)(N)H_(2)`

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in `CH_(3)overset(* *)(N)H_(2),CH_(3)CH=overset(* *)(N)Hand CH_(3)C-=overset(* *)(N)` , the unshared respectively. As the s - character of the hybrid orbital (containing lone pair) of N - atom increases, the electrons are drawn closer to the nitrogen nucles and hence electron donating ability of the amino nitrogen decreases causing decreases in basicity. Thus basic strenght decreases in the sequence :
`CH_(3)overset(* *)(N)H_(2)gtCH_(3)CH=overset(* *)(N)HgtCH_(3)C-=overset(* *)(N)`
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