Question

In which of the following case, central atom and the F-bond has a partial double bond character?

• A. $N{F}_3$
• B. $C{F}_4$
• C. $P{F}_3$
• D. $O{F}_2$

Answer 1

The correct option is C $P{F}_3$

Partial double bond character will occur due to back bonding.
$C,N$ and $O$ does not have vacant d orbital where $F$ can donate its lone pair of electrons so there is no back bonding.
$P$ has vacant d orbitals, here $p\pi -d\pi$ back bonding occurs and partial double bond is observed.