A) \[{{1}^{0}}>{{2}^{0}}>{{3}^{0}}>\operatorname{N}{{\operatorname{H}}_{3}}\]
B) \[{{3}^{0}}>{{2}^{0}}>\operatorname{N}{{\operatorname{H}}_{3}}>{{1}^{0}}\]
C)
D) \[{{\operatorname{NH}}_{3}}>{{1}^{0}}>{{2}^{0}}>{{3}^{0}}\]
Correct Answer: C
Solution :
The correct order of relative basicity of amines in the gas phase is \[{{3}^{o}}>{{2}^{o}}>{{1}^{o}}>N{{H}_{3}}\] The alkyl group releases electron and thus, tends to disperse the positive charge of the alkyl ammonium ion and therefore stabilises it. Since, \[NH_{4}^{+}\] (from \[N{{H}_{3}}\]) has no such alkyl group, it is not stabilised to such an extent as alkylammonium ion.
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