See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# Solution: R/S Configuration of Chiral Carbons **Identify the two chiral centers:** Both carbons bonded to $OH$ groups are chiral (each has 4 different substituents). **For the FRONT carbon (upper):** Assign priorities by atomic number: - $OH$ (oxygen) → Priority **1** - $CH_3$ (right) → Priority **2** - $H$ → Priority **4** - $CH_3$ (left, connected to another carbon) → Priority **3** Orient with priority 4 (H) pointing back. Tracing 1→2→3: the path goes **clockwise** → **R configuration** **For the BACK carbon (lower):** Assign priorities: - $OH$ (oxygen) → Priority **1** - $CH_3$ (right) → Priority **2** - $H$ → Priority **4** - $CH_3$ (left) → Priority **3** Orient with priority 4 (H) pointing back. Tracing 1→2→3: the path goes **clockwise** → **R configuration** **Answer: (C) Front C–(R), back C–(R)** ✓ Both chiral centers have identical substituents in identical spatial arrangements, so both are *R*.