In aqueous solution,which of the following bases has the conjugate acid that possesses the smallest value for pK_a? A)C₆H₅NH₂ B)NH₃ C)(CH₃CH₂)₃N D)(CH₃CH₂)₂NH E)CH₃CH₂CH₂NH₂

Question

Quizplus · Accepted Answer

The conjugate acid of $CH_3CH_2NH_2$ (choice A) is $CH_3CH_2NH_3^+$, which has a smaller pKa (or pKS) value compared to the conjugate acids of the other bases listed. This is because the ethyl group is less electron-donating compared to the more alkylated amines, making the conjugate acid more stable and thus more acidic.

In Aqueous Solution,which of the Following Bases Has the Conjugate