resonance

Question

Which of the following shows resonance?

RankGuru · Accepted Answer

**Resonance** occurs in molecules with a **conjugated system** (alternating single and double bonds, or lone pair adjacent to a double bond).
- **CH₂=CH-CHO (Acrolein)**: Has the structure $CH_2=CH-C(=O)H$. The $\pi$ electrons of the $C=C$ double bond and the $C=O$ double bond are separated by exactly one single bond, creating a conjugated system where electrons can delocalize.
- Propane and Ethanol have only single bonds. Propene ($CH_2=CH-CH_3$) has an isolated double bond but lacks conjugation.

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resonance

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