Find the number of species which undergo hydrolysis at room temperature.

${\mathrm{CCl}}_4,{\mathrm{SiCl}}_4,{\mathrm{AlCl}}_3,{\mathrm{BCl}}_3,{\mathrm{NF}}_3,{\mathrm{PCl}}_5,{\mathrm{PCl}}_3,{\mathrm{SF}}_6$, ${\mathrm{SO}}_2{\mathrm{Cl}}_2$

Because ${\mathrm{SiCl}}_4$ has an empty d orbital in contrast to Si, which does not, it hydrolyzes at ambient temperature. At room temperature, ${\mathrm{PCI}}_{5,}{\mathrm{PCI}}_{3,}{\mathrm{SO}}_2{\mathrm{CI}}_{2,}{\mathrm{AICI}}_3$ likewise passes through the hydrolysis process similar substances.
Thus, there are six such species.

${\mathrm{BCl}}_3,{\mathrm{PCl}}_5,{\mathrm{PCl}}_3,{\mathrm{SO}}_2{\mathrm{Cl}}_2,{\mathrm{AlCl}}_3$