Let’s walk through the absolute configuration assignment step by step for both chiral centers in the given molecule. I’ll explain each move so it feels more like a human conversation than a robotic answer. First, let’s focus on carbon 1 (the one labeled as 1 in red). We need to use the Cahn-Ingold-Prelog rules to assign priorities to the four groups attached to this carbon. The groups are: phenyl (Ph), hydrogen (H), chlorine (Cl), and the rest of the ring (which leads to carbon 2, the hidden chiral center). By atomic number, chlorine gets the highest priority (since Cl has atomic number 17). Next comes the phenyl group (which starts with a carbon, but remember, the ring continues, so we need to compare the next atoms attached to that carbon), followed by the ring carbon (which leads to carbon 2), and finally, hydrogen, which always gets the lowest priority. So, the order of priority is: 1. Cl 2. Phenyl (Ph) 3. The ring carbon (which leads to C2) 4. H Now, arrange the molecule so the lowest priority group (hydrogen) is pointing away from you. Then, trace a path from highest (1) to second (2) to third (3) priority. In the drawing, if you imagine holding the H away from you, the order from Cl → Ph → ring carbon goes in a clockwise direction. That means the absolute configuration at C1 is **R**. Now let’s look at carbon 2 (the hidden chiral carbon). The four groups on this carbon are: hydroxyl group (OH), the part of the ring leading to carbon 1 (which is connected to Cl and Ph), hydrogen, and the other ring carbon. Again, assign priorities. OH gets the highest (since O is atomic number 8). The carbon connected to Cl and Ph will outrank a plain carbon, so the order is: 1. OH 2. The carbon leading to C1 (since it is attached to Cl and Ph, both higher than H or C) 3. The other ring carbon 4. H Orient the molecule so H is pointing away. If you trace from OH → C1 side of the ring → other ring carbon, the path is counterclockwise. This makes the configuration at C2 **S**. So, to sum up, the absolute configurations are: - Carbon 1: **R** - Carbon 2: **S** That’s how you’d determine the configuration for each chiral center in this molecule!