The easiest difference to see is that ionic compounds dissolved in water conduct electricity, while covalent ones do not. Ionic compounds consist of a metal and non-metal, but covalents have only non-metal atoms.
Molecular compound
Ionic Molecular
Nickel manganate is an ionic compound.
molecular, since it is an organic compound
molecular
Fluorine is molecular, but it is an element, not a compound.
A molecular covalent compound
Molecular.See the Related Questions to the left for how to determine if a molecule is molecular of ionic.
Dissolve them in water. If the solution conducts electricity, then the solute is an ionic compound. If not, then it is a molecular compound.
Anhydrous H2CO3 (carbonic acid) is molecular, not ionic. It does not dissociate into ions in the absence of water.
Ammonia is a molecular compound. It consists of individual molecules made up of covalently bonded atoms (one nitrogen and three hydrogen). It does not contain ions like in ionic compounds.
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.