See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# Isomerism in Benzaldoxime **Identify the structure:** Benzaldoxime has the structure: $\text{C}_6\text{H}_5-\text{CH}=\text{N}-\text{OH}$ The key feature is a **$\text{C}=\text{N}$ double bond** with an $-\text{OH}$ group attached to nitrogen. **Analyze possible isomerism:** 1. **Position isomerism** — Not applicable; there's only one functional group 2. **Functional isomerism** — Not applicable; the functional group doesn't change 3. **Metamerism** — Not applicable; no different carbon skeletons exist 4. **Geometrical isomerism** — **APPLICABLE** ✓ **Why geometrical isomerism occurs:** The $\text{C}=\text{N}$ double bond is **rigid** and prevents free rotation. The $-\text{OH}$ group can be positioned on either side of the double bond: - **Syn isomer (E):** $\text{OH}$ and phenyl on the same side - **Anti isomer (Z):** $\text{OH}$ and phenyl on opposite sides These are **non-superimposable, non-mirror image isomers** — the defining characteristic of geometrical isomerism. **Answer: (4) Geometrical**