AIIMS 2019 Chemistry Electrophilic Substitution Reactions MCQ Question

Option D is correct because it reflects the reactivity of the electrophiles in the electrophilic substitution reactions, where b (a highly reactive electrophile) reacts first, followed by a (a moderately reactive electrophile), then d (a less reactive electrophile), and finally c (the least reactive). The other options are incorrect as they misrepresent the relative reactivity of the electrophiles based on their stability and ability to stabilize the positive charge during the reaction mechanism, which is crucial in determining the order of substitution. Understanding the stability of intermediates and the nature of electrophiles is essential for predicting the outcomes of these reactions.