Among the following, the electron-deficient compound is
BeCl2
CCl4
PCl5
BCl3
(1) BeCl2 has 4e−′s
(2) CCl4 has 8e−1s
(3) PCl5 has 10e−′s.
(4) BCl3 has 6e−
So, (1) and (4) are electron-deficient compounds.