Arrange the following 5-membered aromatic heterocycles in decreasing order of their reactivity towar — Aromatic Hydrocarbons Chemistry Question

💡 Solution & Explanation

Reactivity depends on the heteroatom's $+M$ ability. Nitrogen (least electronegative) accommodates a positive charge most readily (Pyrrole). Sulfur's larger $3p$ orbital overlaps poorly with Carbon's $2p$ orbital (Thiophene least reactive).