Which of the following is/are not known ? `PCl_(3), AsCl_(3), SbCl_(3), NCl_(5), BiCl_(5)`.

Explanation

(i) `NCl_(5)` (due to absence of d-orbitals) (ii) `BiCl_(5) (Be^(5+)` being an oxidising agent oxidises `Cl^(-)` ion ot `Cl_(2) and Cl^(-)` ion being a reducing agent reduces `Bi^(5+)` to `Bi^(3+)`).