Among the following, the electron-deficient compound is

(1) ${\mathrm{BeCl}}_2\text{ has }4e^{-\mathrm{\prime }}\mathrm{s}$

(2) ${\mathrm{CCl}}_4\text{ has }8e^{-1}\mathrm{s}$

(3) ${\mathrm{PCl}}_5\text{ has }10e^{-\mathrm{\prime }}\mathrm{s}.$

(4) ${\mathrm{BCl}}_3\text{ has }6e^{-}$

So, (1) and (4) are electron-deficient compounds.