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University of Iowa
Univ. Of Iowa: Introduction to Organic Molecules and Functional Groups [Pdf]
This PDF shows many examples of organic molecules and functional groups.
Curated OER
4 Different Modes of Representation of Covalent Bonds
A tutorial on covalent bonds and intermolecular forces. A good summary weak forces, including Van der Waals forces and an excellent illustration showing the relative strengths of different forces and bonds.