See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# Geometrical Isomerism Analysis **Requirement for geometrical isomerism:** A C=C double bond with two different groups on each carbon atom ($$\ce{C=C}$$ where each carbon has two distinct substituents). ## Analyzing each option: **(A) Benzene ring = C(H)(Br)** - The C=C has: $\ce{H}$ and $\ce{Br}$ on one carbon; benzene ring and $\ce{H}$ on the other - Both substituents are different on each carbon - **Shows cis-trans isomerism** ✓ **(B) Benzene ring = C(H)(Br)** - Same structure as (A) — identical double bond with different groups on each carbon - **Shows cis-trans isomerism** ✓ **(C) Cyclohexene ring = C(H)(Br)** - The C=C has: $\ce{H}$ and $\ce{Br}$ on one carbon; cyclohexenyl and $\ce{H}$ on the other - All four groups around the double bond are different - **Shows cis-trans isomerism** ✓ **(D) Cyclobutene ring (with Br) = C(H)(Br)** - The C=C has: $\ce{H}$ and $\ce{Br}$ on one carbon; cyclobutene-yl and $\ce{H}$ on the other - All four groups are different - **Shows cis-trans isomerism** ✓ ## Conclusion: **All four compounds (A, B, C, D) exhibit geometrical isomerism** because each possesses a C=C double bond where both carbons carry two different substituents, allowing for distinct cis and trans configurations.