See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# Resonating Structure Stability Analysis To determine stability, evaluate each resonating structure based on **formal charges and octet rule compliance**: ## Structure Analysis **Structure (I): $H_2C=\stackrel{+}{N}=\stackrel{-}{N}$** - Positive charge on more electronegative N (unfavorable) - Negative charge on less electronegative N - **Low stability** — charge placement violates electronegativity principle **Structure (II): $H_2C-\stackrel{+}{N}=\stackrel{-}{N}$** - Positive charge on N, negative on terminal N - Better than (I), but positive charge still on N - **Moderate stability** **Structure (III): $H_2C=\stackrel{-}{N}-\stackrel{+}{N}$** - Negative charge on more electronegative N ✓ - Positive charge on less electronegative N ✓ - All atoms satisfy octet rule - **Highest stability** — ideal charge distribution **Structure (IV): $H_2C-\stackrel{-}{N}=\stackrel{+}{N}$** - Negative charge on N (good), but positive on terminal N - Incomplete octet considerations - **Lower stability than (III)** ## Stability Order: **(I) > (III) > (II) > (IV)** The correct order follows: - Most stable structure has negative charge on more electronegative atom (N) - Least stable has positive charge on more electronegative atom **Answer: (B)** ✓