Among the following amines, which one has the highest pKb value in aqueous solution

Question

Among the following amines, which one has the highest pKb value in aqueous solution (A) Methanamine (B) N,N - Dimethylaniline (C) Ethanamine (D) Benzenamine

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/5bfe3a3f6b26365d6703f2110700141e-.png" /> In benzamine, there is resonance effect which decreases its basicity relative to other amines. Due to which it has greatest pK b value.

Q. Among the following amines, which one has the highest $p K_{b}$ value in aqueous solution

Methanamine

$N, N$ - Dimethylaniline

Ethanamine

Benzenamine

$N, N$ - Diethylethanamine

In benzamine, there is resonance effect which decreases its basicity relative to other amines. Due to which it has greatest $p K_{b}$ value.

Q. Among the following amines, which one has the highest pKb​ value in aqueous solution