See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# Determining Absolute Configuration Using R/S Rules **Step 1: Identify the two chiral centers** Both carbons bearing $HO_2C$ and $CO_2H$ groups are stereogenic centers. **Step 2: Assign priorities at the left chiral center** - $HO_2C$ group: O atoms (atomic no. 8) → Priority **1** - $OH$ group: O atom (atomic no. 8) → Priority **2** (compare second atoms: C vs H) - $H$ atom: atomic no. 1 → Priority **4** - The remaining carbon → Priority **3** Orient with H pointing away: $1 \rightarrow 2 \rightarrow 3$ goes **clockwise** → **R** **Step 3: Assign priorities at the right chiral center** - $CO_2H$ group: O atoms (atomic no. 8) → Priority **1** - $OH$ group: O atom (atomic no. 8) → Priority **2** (compare second atoms: C vs H) - $H$ atom: atomic no. 1 → Priority **4** - The remaining carbon → Priority **3** Orient with H pointing away: $1 \rightarrow 2 \rightarrow 3$ goes **clockwise** → **R** **Answer: (B) R, R** ✓ Both stereogenic centers have the same R configuration.