See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

# Analysis of Canonical Structure Stability To determine the least stable canonical structure, evaluate the **position of negative charge** relative to the electron-withdrawing $N^+=O$ group. ## Key Principle Negative charge stability depends on its proximity to electron-withdrawing groups. A negative charge placed **closer to an electron-withdrawing group** is better stabilized through inductive effects. ## Structure Analysis **(a)** Negative charge is **directly adjacent** ($\alpha$-position) to the $N^+=O$ group - Closest proximity to the electron sink - Maximum inductive stabilization **(b)** Negative charge is **two bonds away** ($\beta$-position) from the $N^+=O$ group - Moderate distance; reasonable stabilization **(c)** Negative charge is **three bonds away** ($\gamma$-position) from the $N^+=O$ group - Significant distance; weaker inductive stabilization **(d)** Negative charge is **four bonds away** ($\delta$-position) from the $N^+=O$ group - **Furthest from electron-withdrawing group** - Minimal inductive stabilization - **Least stable** ## Conclusion **Option (a) is the least stable** because the negative charge is positioned farthest from the electron-withdrawing nitrosyl group in the conjugated chain, receiving minimal stabilization compared to structures where the charge is closer to the oxygen.