See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# R/S Configuration Analysis **Compound (A): Benzene ring with OH, H, and CF₃** At the chiral center (benzene carbon): - Priority 1: OH (O, highest atomic number) - Priority 2: CF₃ (C bonded to F atoms) - Priority 3: H (explicitly shown) - Priority 4: Benzene ring (C bonded to C,C,H) Assigning priorities 1→2→3 and noting H points back: **R configuration** ✓ For the second stereocenter on the ring: similar analysis gives **R configuration** ✓ --- **Compound (B): Amino acid with HS and COOH** At the chiral center: - Priority 1: COOH (O atoms give highest priority) - Priority 2: NH₂ (N > S) - Priority 3: HS (S, lower than N) - Priority 4: H Tracing 1→2→3: **R configuration** ✓ --- **Compound (C): Bicyclic structure with CHO and CH₃** At the chiral center: - Priority 1: CHO (C bonded to O=CHO) - Priority 2: CH₃ (C bonded to H,H,H) - Priority 3: CH (C bonded to C,C,H) - Priority 4: H First chiral center: **R configuration** ✓ At the second chiral center (with CH₃): - Priority 1: CHO (C bonded to O) - Priority 2: Quaternary C (C bonded to C,C,C) - Priority 3: CH₂ (C bonded to C,H,H) - Priority 4: H Second chiral center: **S configuration** ✓ --- **Answer: (C) R,S** ✓