See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# Stability of Resonance Structures in Formic Acid **Step 1: Identify each structure's characteristics** - **I**: Standard Lewis structure with $C=O$ double bond and $O-H$ single bond - **II**: Carbocation intermediate with $C^+=O$ double bond (positive charge on C) - **III**: Zwitterionic form with $C^+-O^-$ (separated charges) - **IV**: Carbanion intermediate with $C^-$ (negative charge on C) **Step 2: Apply stability rules for resonance structures** 1. Structures with separated charges are less stable than neutral structures 2. Positive charge on more electronegative atoms (O) is more favorable than on C 3. Negative charge on less electronegative atoms is unfavorable **Step 3: Rank the structures** - **I (Most stable)**: Neutral structure with no charge separation; follows octet rule perfectly - **II (Intermediate)**: Positive charge on C (less electronegative than O), but O has full octet - **III (Less stable)**: Charge separation; negative charge on O is acceptable, but overall less stable than I and II - **IV (Least stable)**: Carbocation/carbanion form with negative charge on C (very unfavorable; C is less electronegative) **Answer: (A) $I > II > III > IV$** Structure I dominates the hybrid because it's the most stable neutral form, while structure IV barely contributes due to unfavorable negative charge placement on carbon.