AIIMS 2018 Chemistry Basicity of Compounds Assertion Reason Question
Assertion: Pyridine is more basic than pyrrole.
Reason: Lone pair of electron on N is pyridine and pyrrorle are different in nature,these form a part aromatic sextet in pyrrole, while not in pyridine.
Both assertion and reason are true and reason is the correct explanation of assertion.
Both assertion and reason 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
Pyridine is more basic than pyrrole because the lone pair of electrons on the nitrogen atom in pyridine is available for protonation, while in pyrrole, the lone pair is involved in the aromatic π-system, making it less available for bonding with protons (H⁺). Thus, both the assertion and reason are true, and the reason correctly explains why pyridine is more basic than pyrrole.
Option B is incorrect because, while both statements are true, the reason directly supports the assertion. Option C is incorrect since both statements are true. Option D is incorrect as both the assertion and reason are valid. Understanding the role of lone pairs in aromatic systems is crucial for grasping basicity in nitrogen-containing heterocycles.
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