Phosphorus pentachloride $(PCl_{5})$:

• A
  on hydrolysis gives an oxo-acid of phosphorus which is tribasic
• B
  on hydrolysis gives an oxo-acid of phosphorus which is a good reducing agent
• C
  has all the five equivalent bonds
• D
  exists as an ionic solid in which cation has octahedral structure and anion has tetrahedral structure