Lewis Structure problem

Question

I AM SO CONFUSED WITH THIS ONE CHOICES ARE 3,4,5,6,7

 

Phosphorus oxychloride has the chemical formula POCl3, with P as the central atom. In order to minimize formal charge, how many bonds does phosphorus make to the other atoms in the molecule? (Count each single bond as one, each double bond as two, and each triple bond as three).

Answer 1

There will be 5 bonds (one to each of the three Cl and two to the oxygen).    This is a hypervalent situation.  This is possible because there are d orbitals available in period 4.    The formal charge on the P is    5 - 5 =0.