option d is correct.
pyrrole is most reactive towards electrophiles because it has least aromatic character among the three. Pyridine has more aromatic character so more stable and...
option D
Explanation--
Oxygen, being more electronegative than nitrogen, distributes more negative charge density upon itself and less upon the ring, thus stabilizing the carbocati...
The aromatic five-membered heterocycles all undergo electrophilic substitution, with a general reactivity order: pyrrole >> furan > thiophene > benzene.
Pyrrole is more reactive th...