AIIMS 2019 Chemistry Electrophilic Aromatic Substitution MCQ Question
Assertion: m-Bromotoluene can be prepared by m-toluidene.
Reason: Amino group is meta directing
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In electrophilic aromatic substitution reactions, an amino group (–NH₂) is an o-p-directing group due to its ability to donate electron density to the aromatic ring through resonance, stabilizing the positive charge in the intermediate carbocation formed during the reaction. Option C illustrates the amino group positioned in such a way that it enhances the reactivity of ortho and para positions, making them more favorable for substitution. Other options may depict substituents that are either deactivating or meta-directing, which do not enhance the reactivity at the ortho and para positions, thus failing to demonstrate the o-p-directing nature of the amino group.
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