A) \[{{(C{{H}_{3}})}_{2}}NH>C{{H}_{3}}N{{H}_{2}}>{{(C{{H}_{3}})}_{3}}N>N{{H}_{3}}\]
B) \[{{(C{{H}_{3}})}_{3}}N>{{(C{{H}_{3}})}_{2}}NH>C{{H}_{3}}N{{H}_{2}}>N{{H}_{3}}\]
C) \[{{(C{{H}_{3}})}_{2}}NH>{{(C{{H}_{3}})}_{3}}N>C{{H}_{3}}N{{H}_{2}}>N{{H}_{3}}\]
D) \[{{(C{{H}_{3}})}_{3}}N>C{{H}_{3}}N{{H}_{2}}>{{(C{{H}_{3}})}_{2}}NH>N{{H}_{3}}\]
Correct Answer: B
Solution :
Basicity of amines depends upon the availability of lone pair of electrons of nitrogen for donation.\[-\text{C}{{\text{H}}_{\text{3}}}\]group, being electron donating, increases the electron density over nitrogen and thus, the lone pair of nitrogen is more available for donation. As the number of \[-\text{C}{{\text{H}}_{\text{3}}}\]group increases, basicity increases. Thus, the order of basicity of given amines (in gaseous phase) is \[{{(C{{H}_{3}})}_{3}}N>{{(C{{H}_{3}})}_{2}}NH>C{{H}_{3}}N{{H}_{2}}>N{{H}_{3}}\] \[{{3}^{o}}\]amines has less basicity due to steric hindrance in aqueous solution.
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