AIIMS 2019 Chemistry Electrophilic Substitution Reactions MCQ Question
Assertion : Toluene reacts with , to give -isomer as the major product. Reason : This is due to steric hindrance at the -position, so it always from -isomer as the major product.
If both assertion and reason are true and reason is correct explanation of assertion
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The statement is true because the —CH₃ group exhibits both +R (resonance) and +I (inductive) effects, making it an ortho- and para-directing substituent in electrophilic aromatic substitution reactions. However, steric hindrance at the ortho position often leads to the formation of the para isomer as the major product. Options B and C are incorrect as they misrepresent the directing effects of the —CH₃ group and the influence of steric factors, respectively. Understanding these concepts is crucial for predicting the outcomes of electrophilic substitution reactions in aromatic compounds.
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