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Answer» `NH_(3)ltC_(6)H_(5)NH_(2)(C_(2)H_(5))_(2)NHltC_(2)H_(5)NH_(2)lt(C_(2)H_(5))_(3)N`
`C_(6)H_(5)NH_(2)ltNH_(3)lt(C_(2)H_(5))lt(C_(2)H_(5))_(3)Nlt(C_(2)H_(5))_(2)NHltC_(2)H_(5)NH_(2)`
`C_(6)H_(4)NH_(2)ltNH_(3)ltC_(2)H_(5)NH_(2)lt(C_(2)H_(5))_(3)Nlt(C_(2)H_(5))_(2)NH`
`C_(6)H_(5)NH_(2)lt(C_(2)H_(5))_(3)NltNH_(3)ltC_(2)H_(5)NH_(2)lt(C_(2)H_(5))_(2)NH` Solution :BASICITY of amines increase with increase in NUMBER of `-CH_(3)` groups (or any group which cause +I effect), due to increase in electron DENSITY on N atom. As a rule, the basicity of t-amine should be more than that of s-amine, but actually it is FOUND to be lesser than s-amines. this is due to steric hinderence of bulkier alkyl groups, which decreases the availability of line pair of electron on the N atom of the amino group. Hence the correct order of basicity is:
`(CH_(3))_(2)NHgt(CH_(3))_(3)NgtCH_(3)NH_(2)`
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