With respect to electrophilic aromatic substitution, reactivity order of pyrrole, pyridine and indole is · ABC26OR0010
Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Aromaticity · Exam: CSIR NET JUNE 2011 · Marks: 2 · Difficulty: Hard
With respect to electrophilic aromatic substitution, reactivity order of pyrrole, pyridine and indole is
(a)indole > pyrrole > pyridine
(b)pyrrole > pyridine > indole
(c)pyrrole > indole > pyridine
(d)indole > pyridine > pyrrole
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
Pyrrole is the most reactive (electron-rich five-membered ring); indole is somewhat less reactive because part of the π density is shared with the benzene ring; pyridine is strongly deactivated (electron-poor, protonated by acids).