Which of the following compound CANNOT act as a Lewis base?

Lewis base: Chemical species which has capability to donate electron pair.

In ${\mathrm{NF}}_3, {\mathrm{SF}}_4, {\mathrm{ClF}}_3$ central atom (i.e. $\mathrm{N},\mathrm{S},\mathrm{Cl}$)
having lone pair therefore act as Lewis base.

In ${\mathrm{PCl}}_5,$ central atom $\left(\mathrm{P}\right)$ does not have lone pair therefore does not act as Lewis base.