Question

Which of the following compounds can not exist?

• A. $N{F}_5$
• B. $Br{F}_5$
• C. $Sb{F}_5$
• D. $P{F}_5$

Answer 1

The correct option is A $N{F}_5$

Since $N$ has only $2s$ and $2p$ orbital in its valence shell and it does not contain any vacant $d$-orbital, thus it cannot form $N{F}_5$.