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Arrange the following : In increasing order of basic strength : C_(6)H_(5)NH_(2), C_(6)H_(5)N(CH_(3))_(2), (C_(2)H_(5))_(2)NH" and "CH_(3)NH_(2). |
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Answer» Solution :Refer to (i) above. Relative basic strength of the amines, `C_(6)H_(5)NH_(2), C_(6)H_(5)NHCH_(3)" and "(C_(2)H_(5))_(2)NH` decreases in the ORDER : `""(C_(2)H_(5))_(2)NH gt C_(6)H_(5)NHCH_(3) gt C_(6)H_(5)NH_(2)` CONVERSELY, the basic strength of these amines increase in the order : `""C_(6)H_(5)NH_(2) lt C_(6)H_(5)NHCH_(3) lt (C_(2)H_(5))_(2)NH` Among `CH_(3)NH_(2)" and "(C_(2)H_(5))_(2)NH`, due to the GREATER +I-effect of the two `C_(2)H_(5)` groups over one `CH_(3)` GROUP, `(C_(2)H_(5))_(2)NH` is more basic than `CH_(3)NH_(2)`. Thus, the basic strength of the four amines follows the order : `C_(6)H_(5)NH_(2) lt C_(6)H_(5)NHCH_(3) lt CH_(3)NH_(2) lt (C_(2)H_(5))_(2)NH` |
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