Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Assign CIP Priorities: Determine the priority of groups around the chiral center for each molecule based on atomic number (e.g., in A: $-OH>-COOH>-C{H}_3>-H$).

Determine Absolute Configuration: Find the $R/S$ configuration by tracing from priority $1\to 2\to 3$.

Compare Configurations: Molecules (B), (C), and (D) all have the same $(S)$-configuration.

Conclusion: Molecule (A) has the opposite $(R)$-configuration, making it different from the others.