A) \[1{}^\circ >2{}^\circ >3{}^\circ >N{{H}_{3}}\]
B) \[3{}^\circ >2{}^\circ >N{{H}_{3}}>1{}^\circ \]
C) \[3{}^\circ >2{}^\circ >1{}^\circ >N{{H}_{3}}\]
D) \[N{{H}_{3}}>1{}^\circ >2{}^\circ >3{}^\circ \]
Correct Answer: C
Solution :
[c] The correct order of relative basicity of amines in the gas phase is \[3{}^\circ >2{}^\circ >1{}^\circ >N{{H}_{3}}\] The alkyl group releases electron and thus, tends to disperse the positive charge of the alkyl ammonium ion and therefore stabilises it. Since, \[N{{H}_{4}}^{+}\] (from\[N{{H}_{3}}\]) has no such alkyl group, it is not stabilised to such an extent as alkylammonium ion.
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