Question

Amongst the trihalides of nitrogen, which one is least basic?

• A. $NF_3$
• B. $NCl_3$
• C. $NBr_3$
• D. $NI_3$

Answer 1

Answer: (A)

$NF_3$

Answer 2

The electron withdrawing inductive effect of halogen
decreases electron density on nitrogen, lowers basic
strength. Since, fluorine is most electronegative, $NF_3$ is
least basic.