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AP Chemistry
2.6 Resonance and Formal Charge
2.5 Lewis Diagrams
2.2 Intramolecular Force and Potential Energy
IntermediateMCQDrawing RepresentationsConceptual23.9k
A grayscale diagram displays two framed structural panels side by side. The left panel is labeled \(\text{HCOOH}\) and shows a single Lewis structure: a central \(\text{C}\) atom with a single bond to a left-side \(\text{H}\) atom, a double bond to an upper-right \(\text{O}\) atom carrying exactly 2 lone pairs, and a single bond to a lower-right \(\text{O}\) atom carrying exactly 2 lone pairs, which in turn is single-bonded to a terminal \(\text{H}\) atom. No lone pairs exist on the \(\text{C}\) atom or \(\text{H}\) atoms. The right panel is labeled \(\text{HCOO}^-\) and shows two structures enclosed in large brackets with a superscript minus sign: Structure 1 has a central \(\text{C}\) single-bonded to a left-side \(\text{H}\), double-bonded to an upper-right \(\text{O}\) with 2 lone pairs, and single-bonded to a lower-right \(\text{O}\) with 3 lone pairs. A double-headed horizontal resonance arrow points to Structure 2, which has a central \(\text{C}\) single-bonded to a left-side \(\text{H}\), single-bonded to an upper-right \(\text{O}\) with 3 lone pairs, and double-bonded to a lower-right \(\text{O}\) with 2 lone pairs. No other particles, labels, text, or annotations appear.
Lewis structures of \(\text{HCOOH}\) and resonance contributors of \(\text{HCOO}^-\)
The Lewis diagram for formic acid, \(\text{HCOOH}\), and two resonance contributors for the formate ion, \(\text{HCOO}^-\), are shown above. Based on these representations, which of the following correctly compares the carbon-oxygen bonds in the two species?

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