It is a molecular (covalent) compound. Present day text books refer to a covalent compound as a molecular compound, as opposed to an ionic one.
For phosphorus trioxide, P2O3 formula unit, P4O6 molecular formula
Ionic Molecular
PtO2 is ionic
molecular
ionic
it is ionic
It is molecular
Molecular compound
A molecular covalent compound
CO is a molecular compound. It consists of a covalent bond between carbon and oxygen atoms.
Ionic bonds are strong, molecular bonds are relatively weak.
Anhydrous H2CO3 (carbonic acid) is molecular, not ionic. It does not dissociate into ions in the absence of water.