The number of following molecules that do not hydrolyse at room temperature are.${\mathrm{CCl}}_4,{\mathrm{SF}}_6,{\mathrm{NF}}_3,{\mathrm{XeF}}_2,{\mathrm{PCl}}_5$

No hydrolysis of ${\mathrm{CCl}}_4$ occurs at normal temperature.
At room temperature, ${\mathrm{CCl}}_4$does not undergo hydrolysis. Since the C atom lacks an empty orbital to take the lone pair electrons from the ${\mathrm{H}}_2\mathrm{O}$ molecule (Nucleophile).
No hydrolysis for ${\mathrm{CCl}}_4+{\mathrm{H}}_2\mathrm{O}.$${\mathrm{CCl}}_4,{\mathrm{SF}}_6\text{ and }{\mathrm{NF}}_3\text{ do not hydrolyse at room }$