If a molecule demonstrates paramagnetism, then : I. The substance can have both paired and unpaired electrons. II. The bond order is not a whole number. III. It can be determined by drawing a Lewis structure. IV. It must be an ion.

The bond order is not a whole number.

Explanation:

If a molecule is paramagnetic, then there are unpaired electrons in some of its molecular orbitals. This will cause the bond order not to be a whole number when treated by applying the ordinary molecular orbital theory to the molecule.

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the answer would be b i believe