1.

Considering the basic strength of amines in aqueous solution, which one has the smallest pK_(b) value?

Answer»

`C_(6)H_(5)NH_(2)`
`(CH_(3))_(2)NH`
`CH_(3)NH_(2)`
`(CH_(3))_(3)N`

Solution :Order of decreasing basic strength of AMINES in aqueous solution is
`underset(2^(@))((CH_(3))_(2))NHgt underset(1^(@))(CH_(3))NH_(2)gt underset(3^(@))((CH_(3))_(3))N gt underset("Aniline")(C_(6))H_(5)NH_(2)`
Basic strength `PROP K_(b) (1)/(pKb)`
Hence `(CH_(3))_(2)NH` has the smallest pKb value.


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