Identify the species that function as electrophiles from the given list: — Reaction Mechanism Chemistry Question

💡 Solution & Explanation

Electrophiles are electron-deficient species that act as Lewis acids. $AlCl_3$ and $BH_3$ are neutral molecules with an incomplete octet (vacant p-orbital) at the central atom. $Br^+$ is a positively charged species. $CN^-$ is negatively charged and has lone pairs, making it a nucleophile.