Question

How many number of species do not exist :$PC{l}_5,P{H}_5,S{F}_6,S{H}_6,PB{r}_6^{-}O{F}_4$

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

Answer: (C)

$P{H}_5,S{H}_6\to$ not exist due to non expandable covalency

$O{F}_4\to$ O-atom does not have vacant d-orbital.

$PB{r}_6^{-}\to$ steric repulsion