Question

Which of the following halide undergoes in hydrolysis via $S_{N^1}$ reaction?

• A. $B{Cl}_3$
• B. ${NF}_3$
• C. $N{Cl}_3$
• D. $As{Cl}_3$

Answer 1

The correct option is B ${NF}_3$

Under ordinary conditions, $N{F}_3$ does not hydrolyses via $S_{N_2}$mechanism because $H_{2}O$ (which should act as a nucleophile) cannot attack any of Nitrogen or Fluorine atom due to absence of vacant orbitals of suitable energy.

But, under drastic conditions it gives $N_2{O}_3$ and $HF$ via series of reactions involving 3 times $S_{N_1}$ with deprotonation and then 2 times dehydration.