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The order of basicity of amines in gaseous state is :
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$3^{\circ}>2^{\circ}>1^{\circ}>\mathrm{NH}_3$
$3^{\circ}>2^{\circ}>1^{\circ}>\mathrm{NH}_3$
The correct order of relative basicity of amines in the gas phase is $3^{\circ}>2^{\circ}>1^{\circ}>\mathrm{NH}_3$ The alkyl group releases electron and thus, tends to disperse the positive charge of the alkyl ammonium ion and therefore stabilises it. Since, $\mathrm{NH}_4{ }^{+}$(from $\mathrm{NH}_3$ ) has no such alkyl group, it is not stabilised to such an extent as alkylammonium ion.
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