Which among the following amines has the lowe | vedclass

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(B) The basicity of amines is inversely proportional to their $pK_{b}$ values. In the gas phase or non-polar solvents,the basicity order is $3^{\circ}

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$(CH_3CH_2)_2NH$

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(B) The basicity of amines is inversely proportional to their $pK_{b}$ values. In the gas phase or non-polar solvents,the basicity order is $3^{\circ} > 2^{\circ} > 1^{\circ} > NH_3$. However,in aqueous solution,the basicity is determined by a combination of inductive effect,solvation effect,and steric hindrance. For ethylamines in aqueous solution,the order of basicity is $(CH_3CH_2)_2NH > CH_3CH_2NH_2 > (CH_3CH_2)_3N > C_6H_5NH_2$. Since $(CH_3CH_2)_2NH$ is the most basic,it will have the lowest $pK_{b}$ value.

Which among the following amines has the lowest $pK_{b}$ value?

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