Question

Which of the following is least basic?

• A. $\text{N}\text{F}_{3}$
• B. $\text{N}\text{C}\text{l}_{3}$
• C. $\text{N}\text{B}\text{r}_{3}$
• D. $\text{N}\text{I}_{3}$

Answer 1

Answer: (A)

As the central atom in all the given molecule is same therefore the basicity depends on the surrounding atom. As fluorine is the most electronegative element thus it has the least tendency to donate its lone pair to central atom $\text{N}$ hence, its basicity will be least.