A) \[{{\operatorname{R}}_{3}}C-N{{H}_{2}}\]
B) \[{{\operatorname{R}}_{2}}NH\]
C) \[\operatorname{R}-N{{H}_{2}}\]
D) \[{{\operatorname{NH}}_{3}}\]
Correct Answer: D
Solution :
\[{{\operatorname{pK}}_{b}}\]values: The basicity of an amine can be expressed in terms of PKb value which is the negative logarithm of basicity constant i.e. \[{{\operatorname{pK}}_{b}}=log\,\,{{K}_{b}}\] Its order is, in aliphatic amines \[- 3{}^\circ amine >\] \[2{}^\circ amine > 1{}^\circ amines > N{{H}_{3}}\] But in case of ammonium cation there is steric repulsion to H-bonding and hence stability further decreases like \[\operatorname{NH}3 > 1{}^\circ amine > 2{}^\circ amine > 3{}^\circ amines\]
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