Question

Which of the following is the most basic ?

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

Lone pair of electrons present at $N$ in $(a)$ is in $s{p}^2$ -hybrid orbital (less available).

Lone pair of electrons present at $N$ in $(b)$ is in hyperconjugation with benzene ring therefore, these are also less available.

Aniline is less basic in nature.

Lone pair of electrons of $N$ in (d) are available freely. So, this compound is the most basic.