- SO$_2$: Typically represented with resonance structures involving formal charges or dative bonding character. - HNO$_2$ (Nitrous acid): H-O- N=O. The standard Lewis structure minimizes formal charges to zero for all atoms and is drawn using only single and double covalent bonds without requiring a coordinate bond. - HNO$_3$ (Nitric acid): H-O-N(=O)O with resonance. Commonly represented with a coordinate bond N->O to account for formal charges (+1 on N, -1 on one O). - H$_2$SO$_4$ (Sulfuric acid): (H-O)$_2$S(=O) $_2$. A standard representation uses an expanded octet for sulfur and results in zero formal charges without requiring coordinate bonds. However, representations using coordinate bonds (S->O) are also possible. Among the given options, HNO$_2$ is the molecule that is consistently represented without coordinate bonds in its standard Lewis structure, which adheres to the octet rule and results in zero formal charges. - ion, the number of bond pairs and