JEE Main levelSingle correct optionDifficulty 2 of 3g2070
Assertion (A): Pyrrole is a much weaker base than pyridine.
Reason (R): The nitrogen lone pair in pyrrole is part of the aromatic pi sextet, whereas in pyridine it lies in an sp2 orbital in the plane of the ring.
ABoth A and R are true but R is not the correct explanation of A
BA is true but R is false
CBoth A and R are true and R is the correct explanation of A
DA is false but R is true
Answer: C
Both statements are true. Because the pyrrole N lone pair is needed for aromaticity, it is unavailable for protonation, while the pyridine lone pair is orthogonal to the pi system and free to bind HX+. So R explains A.