AIIMS 2017 Chemistry Nucleophilic Substitution Assertion Reason Question
In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choice.
Assertion (A) Aryl halides undergo nucleophilic substitution with ease.
Reason (R) Hybridisation of C-atom attached to halide is − hybrid.
Both the statements are true and Reason is the correct explanation of Assertion.
Both the statements are true but Reason is not the correct explanation of Assertion.
Assertion is true but Reason is false.
Both Assertion and Reason are false.
Correct Answer
Detailed Explanation
Option A is correct because both the assertion and reason accurately describe the properties of aryl halides. Aryl halides have a carbon atom that is sp² hybridized, which contributes to the resonance stabilization of the C–X bond, making it shorter and stronger due to partial double bond character. This increased bond strength hinders nucleophilic substitution reactions. Other options are incorrect because they either misrepresent the relationship between the assertion and reason or incorrectly state the validity of one or both statements.
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