List of bonds in a molecule
BondList[mol]
BondList[mol, patt]
BondList[mol, patt, "prop"]
mol = Molecule["CCO"]; BondList[mol]
→ {Bond[{1, 2}, Single], Bond[{2, 3}, Single], Bond[{1, 4}, Single], Bond[{1, 5}, Single], Bond[{1, 6}, Single], Bond[{2, 7}, Single], Bond[{2, 8}, Single], Bond[{3, 9}, Single]}