Question

Which of the following trihalides can not be hydrolysed?

• A. $P{F}_3$
• B. $P{Cl}_3$
• C. $As{Cl}_3$
• D. $Sb{Cl}_3$

Answer 1

The correct option is A $P{F}_3$

In $PC{l}_3$, $AsC{l}_3$, $SbC{l}_3$, $X$ (Central atom) has positive charge which attacks the lone pair of electrons on water molecules.

$N{F}_3$ is not hydrolysed due to lack of d-orbitals in $N$ and $F$.

Option A is correct.