A) \[{{1}^{o}}\]amine
B) \[{{2}^{o}}\]amine
C) \[{{3}^{o}}\]amine
D) quaternary salt
Correct Answer: D
Solution :
\[{{C}_{3}}{{H}_{9}}N\]represents following structures \[\underset{\begin{smallmatrix} \text{Propanamine} \\ \,\,\,\,\text{(}{{\text{1}}^{\text{o}}}\text{amine)} \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}N{{H}_{2}}}}\,C{{H}_{3}}\underset{\begin{smallmatrix} \text{N}-\text{methyl}\,\text{ethanamine} \\ \text{(}{{\text{2}}^{\text{o}}}\,\text{amine)} \end{smallmatrix}}{\mathop{C{{H}_{2}}-\overset{H}{\mathop{\overset{|}{\mathop{N}}\,}}\,-C{{H}_{3}}}}\,\] \[\underset{\begin{smallmatrix} \text{N,N}-\text{dimethyl}\,\text{methanamine} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,({{3}^{o}}\,amine) \end{smallmatrix}}{\mathop{C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{N}}\,}}\,-C{{H}_{3}}}}\,\] \[\therefore \]quaternary salt cannot be represented by\[{{C}_{3}}{{H}_{9}}N.\]
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