Which of the following is/are not known? PCl3, AsCl3, SbCl3, NCl5, BiCl5

(1) NCl5 (due to absence of d-orbitals)

(2) BiCl5 (Bi5+ being an oxidizing agent oxidizes Cl ion to Cl2 and Cl-ion being a reducing agent reduces Bi5+ to Bi3+).

Related Questions:

Which is more basic N(CH3)3 or N(SiH3)3 , explain?

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Why Nitrogen dioxide (NO2) dimerises to form Dinitrogen tetraoxide (N2O4)?

Why Nitrogen dioxide (NO2) is coloured but Dinitrogen tetraoxide (N2O4) is colourless?

Hypophosphorous acid (H3PO2) and Phosphorous acid (H3PO3) act as as good reducing agents while H3PO4 does not.Why?