See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# Resonating Structures of Diazomethane **Understanding Diazomethane ($CH_2N_2$):** Diazomethane has the structure $CH_2-N=N$ with a formal negative charge on one nitrogen and positive on the other. **Analyzing Each Structure:** **(B) $CH_2=\widehat{N}=N^-$** - C=N double bond with formal positive charge on middle nitrogen and negative on terminal nitrogen - Valid resonance structure ✓ **(C) $CH_2-\widehat{N}\equiv N$** - C-N single bond with formal positive charge on middle nitrogen and N≡N triple bond - Valid resonance structure ✓ **(A) $CH_2\overset{N}{\curvearrowleft}$ (cyclic structure)** - Represents a three-membered ring (aziridine-like carbene) - This would require a different bonding arrangement and does NOT represent a resonance structure of diazomethane - Invalid ✗ **Why (A) is not a resonating structure:** Resonance structures must have the **same atomic connectivity**—only electron distribution changes. Structure (A) shows a cyclic arrangement with different connectivity (C bonded in a ring), not just electron rearrangement of the linear diazomethane structure. **The answer is (A).**