Question

resonance structures are needed to describe the bonding in which of the following? co₂ h₂o cif₃ hno₃ ch₄

Explanation:

Resonance structures describe delocalized electrons in molecules where a single Lewis structure is insufficient. $\text{CO}_2$ has double bonds but no delocalization; $\text{H}_2\text{O}$ and $\text{CH}_4$ have only single bonds; $\text{ClF}_3$ has lone pairs but no delocalized electrons. $\text{HNO}_3$ has a nitrate group with delocalized π electrons across N and three O atoms, requiring resonance to represent bonding accurately.

Answer:

HNO₃