AIIMS 2018 Chemistry Aromatic Compounds MCQ Question

Option B is correct because it involves a reaction mechanism that leads to the formation of an unexpected product due to incorrect regioselectivity or stereochemistry. For instance, if the reaction involves electrophilic addition to an alkene, the wrong product may arise if Markovnikov's rule is not followed, resulting in an undesired alkyl halide. In contrast, options A and C likely represent reactions that proceed through well-understood mechanisms, yielding the expected products based on established organic chemistry principles, such as carbocation stability or nucleophilic attack patterns. Understanding these concepts is crucial for predicting reaction outcomes accurately.