See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

**Step 1: Identify the stereogenic center** Both compounds I and II have a central carbon atom bonded to four different groups: halogen atoms (F, Cl, Br, I) and an organic group ($CH_3$ or H). **Step 2: Assign priorities using CIP rules** For compound I: $Br > Cl > I > H$ (by atomic number) - Priority: Br(1), Cl(2), I(3), H(4) For compound II: $Br > Cl > I > F$ (by atomic number) - Priority: Br(1), Cl(2), I(3), F(4) **Step 3: Compare atom-for-atom connectivity** - Compound I has groups: F, Cl, Br, $CH_3$, I - Compound II has groups: Br, Cl, I, F, $CH_3$, H The atoms attached to the central carbon are **different**: - I contains: C, H, F, Cl, Br, I - II contains: C, H, Cl, Br, I, F Both have the same four substituents but in different spatial arrangements. **Step 4: Determine the relationship** Since compounds I and II: - Have the same molecular formula (constitutional isomers) - Are not mirror images (not enantiomers) - Have the same connectivity of atoms (not constitutional isomers in the strict sense) - Differ only in 3D spatial arrangement around the same stereogenic center They are **constitutional isomers** because they have different connectivity of atoms at the central carbon despite having identical atomic composition. **Answer: (C) Constitutional isomers**