How to find dpi-ppi bonds and as well ppi-ppi bonds.For an example in XeO4 there are 4 dpi-ppi bonds.But I can't understand that.Similarly,they are asking us to find how many dpi-ppi bonds are present in so3,so2,xeo3,clo4-.po43-.Please describe clearly with a comphrehensive method as well with short tricks.
