Describe the difference in the structures of $PCl_5$ and $PCl_3$.

• A
  $PCl_5$ is trigonal bipyramidal,$PCl_3$ is pyramidal.
• B
  $PCl_5$ is square pyramidal,$PCl_3$ is trigonal planar.
• C
  $PCl_5$ is tetrahedral,$PCl_3$ is trigonal bipyramidal.
• D
  $PCl_5$ is octahedral,$PCl_3$ is tetrahedral.