Complete the following resonance structures for $\mathrm{POCl}_{3}$.
a. Would you predict the same molecular structure from each resonance structure?
b. What is the hybridization of $\mathrm{P}$ in each structure?
c. What orbitals can the $\mathrm{P}$ atom use to form the $\pi$ bond in struc-
ture $\mathrm{B}$ ?
d. Which resonance structure would be favored on the basis of formal charges?