Question

Which of the following is most planar?

• A. $P_3{N}_{3}C{l}_3$
• B. $P_3{N}_3(Ph{)}_6$
• C. $P_3{N}_3{F}_6$
• D. $P_3{N}_3(C{H}_3{)}_6$

Answer 1

The correct option is C

$P_3{N}_3{F}_6$

More the electronegative elements attached on P, more is the partial positive charge, more is the extent of back-bonding, more is the planarity. Since, F is the most electronegative among these, so $P_3{N}_3{F}_6$ is most planar.