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  4. How many number of species do not exist :PCl 5, PH 5, SF 6, SH 6, PBr 6- OF 4

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Q. How many number of species do not exist :$PCl _{5}, PH _{5}, SF _{6}, SH _{6}, PBr _{6}^{-} OF _{4}$

Chemical Bonding and Molecular Structure

Solution:

$PH _{5}, SH _{6} \rightarrow$ not exist due to non expandable covalency

$OF _{4} \rightarrow$ O-atom does not have vacant d-orbital.

$PBr _{6}^{-} \rightarrow$ steric repulsion