AIIMS 2019 Chemistry Elimination Reactions MCQ Question

Option A is correct because alcoholic KOH promotes elimination reactions, leading to the formation of alkenes through dehydrohalogenation or dehydration. In this context, compound 'a' is the most reactive due to the presence of a good leaving group and suitable hydrogen atoms for elimination, followed by 'b', 'c', and 'd', which have progressively less favorable conditions for elimination. Other options are incorrect as they misorder the reactivity based on the stability of the resulting alkenes or the presence of steric hindrance, which affects the elimination pathway. Understanding the mechanism of elimination reactions is crucial, as it highlights the importance of the substrate structure and the reaction conditions in determining the product distribution.