hydrogen bonds are the strongest intermolecular bonds. They have about 5 kcal/mol for water and bonds H-O---H and a bit less if there are N atoms instead of O. It occur also for F. Ionic bonds are intramolecular bonds. Their force are 24-240 Kcal. Being elettrostatic bonds they follow Colomb law and they are stronger when hight is the charge of the ions and when nearer are the ions, and then smaller are the involved atoms.