BPSC 70th Prelims Re Exam Held on 4 Jan 2025

Concept:Electrophiles are electron-deficient species that accept electron pairs. They typically carry a positive charge or have an incomplete octet.Explanation:$Na^{+}$ (sodium ion) has a positive charge but no empty orbital to accept electrons. It is a spectator ion and not an electrophile.$BF_{3}$ (boron trifluoride) has an incomplete octet on boron, making it an electron-pair acceptor — it is an electrophile.$H^{+}$ (proton) has zero electrons and readily accepts electron pairs, so it is a strong electrophile.Thus, only $Na^{+}$ does not act as an electrophile among the given options.Answer:Option A – $Na^{+}$