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Arrange the following in the decreasing ...

Arrange the following in the decreasing order of basic strength: `CH_(3)CH_(2)CH_(2)NH_(2), CH_(2) = CH- CH_(2)NH_(2) and CH -= - CH_(2) NH_(2)`

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The order of basic strength is `CH_(3)CH_(2)CH_(2)NH_(2) gt CH_(2) = CH- CH_(2)NH_(2) gt CH -= C CH_(2)NH_(2)`. Alkyl group is electron releasing and stabilises the conjugate acid of propyl amine. Alkyenyl and alkynyl groups connected to `-CH_(2)NH_(2)` are electron withdrawing groups and destabilise the conjugate acid of `CH_(2)= CHCH_(2)NH_(2) and Ch -= C CH_(2)NH_(2)`. hence they become weak bases
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