Question

Which of following molecules has the d-character in P-Cl bond?

• A. $PC{l}_3$
• B. $P{F}_{2}C{l}_3$
• C. $PC{l}_5$
• D. All of the above

Answer 1

The correct option is C $PC{l}_5$

According to Bent's rule, the more electronegative atoms tend to occupy the orbitals that has less s- character. $s{p}^{3}d$ is a combination of $s{p}^2$ and $pd$ hybdridization. The equatorial bonds are made up of $s{p}^2$ and the axial bonds are made up of $pd$. Hence F in $P{F}_{2}C{l}_3$ occupies the $pd$ orbital and hence Cl will occupy the $s{p}^2$ orbital.

$PC{l}_3$ has one lone pair and three bond pairs. It has $s{p}^3$ hybridization.

$PC{l}_5$ has five bond pairs. It has $s{p}^{3}d$ hybridization and hence it has $P-Cl$ bond with d-character.