See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# Resonating Structure Analysis for Methyl Methanoate ($CH_3COOCH_3$) **Step 1: Identify the resonating structures** - **Structure I**: Neutral form with $C=O$ double bond (canonical form) - **Structure II**: Negative charge on carbon, positive on oxygen - **Structure III**: Negative charge on oxygen, positive on carbon **Step 2: Apply stability criteria for resonating structures** A resonating structure is a "major contributor" if it: - Minimizes formal charges - Places negative charges on more electronegative atoms - Avoids separating opposite charges **Step 3: Evaluate each structure** | Structure | Formal Charges | Stability | |-----------|---|---| | **I** | None | Highest (no charge separation) | | **II** | $C^-$, $O^+$ | Low (negative charge on less electronegative C) | | **III** | $O^-$, $C^+$ | **Lowest** (negative on electronegative O, but significant charge separation) | **Step 4: Determine major vs. minor contributors** - **Structure I** is the **major contributor** (lowest energy, no formal charges) - **Structure III** is the **minor contributor** (highest energy due to unfavorable charge distribution despite O being electronegative) **Answer: (C) III** is the minor contributor because it places a formal positive charge on carbon and concentrates negative charge on oxygen, creating significant electrostatic instability compared to Structure I.