Correct stability order of resonance structures of CH₃-CH=CH-CHO:

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Step 1: Resonance Stability Principles
- Neutral structures (III) are more stable than charged zwitterions (I, II).
- In zwitterions, having the negative charge on the more electronegative atom (Oxygen) is more stable.

Step 2: Comparing (I) and (II)
- (II): Cation on Carbon, Anion on Oxygen. (Relatively stable for a charge-separated structure).
- (I): Anion on Carbon, Cation on Oxygen. (Highly unstable due to positive charge on electronegative Oxygen and negative on Carbon).

Step 3: Stability

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