Question

what intermolecular forces can be found in the molecules below:

1. HCO3
2. BH3
3. CN

Answer 1

Your best bet here is to Google "intermolecular forces" and read about the varius IMFs.
All will have London IM forces.
In addition, HCO3^- and CN^- will have ion-dipole between the ion and water molecules.BH3 will have H bonding.