AIIMS 2018 Chemistry Reaction Sequences MCQ Question

Option A is correct because it provides the necessary reagents that facilitate the desired chemical reaction, leading to the formation of the final product through a specific mechanism, such as nucleophilic substitution or elimination. For instance, if the reaction involves the formation of an ester, the presence of a carboxylic acid and an alcohol in option A would be essential for esterification.

Other options may lack key reagents or include compounds that do not participate in the reaction pathway, such as solvents or by-products that do not contribute to the formation of the target molecule. Understanding the role of each reagent in the reaction mechanism is crucial for predicting the outcome of organic transformations.