Question

The pair of trihalides of group 15 elements which are not readily hydrolysed are________.

• A. $N{F}_3$ and $NC{l}_3$
• B. $N{F}_3$ and $P{F}_3$
• C. $PC{l}_3$ and $P{F}_3$
• D. $N{F}_3$ and $PC{l}_3$

Answer 1

The correct option is B $N{F}_3$ and $P{F}_3$

$N{F}_3$ and $P{F}_3$ are not hydrolysed. $N{F}_3$ is not hydrolysed due to lack of vacant d-orbital in N for coordination by water. $P{F}_3$ is not hydrolysed because P - F bond is stronger than P - O bond.