See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

**Analysis of each species:** An **electrophile** is an electron-deficient species that accepts electron pairs. **(1) $CH_3^+$ (methyl cation)** - Positively charged carbon with incomplete octet - Electron-deficient → **IS an electrophile** ✓ **(2) $CH_2=CH_2$ (ethene)** - Contains a $\pi$ bond with high electron density - The $\pi$ electrons are available to donate to electrophiles - **IS a nucleophile, NOT an electrophile** ✗ **(3) $AlCl_3$ (aluminum chloride)** - Al has only 6 electrons (lacks 2 for octet) - Strong Lewis acid that accepts electron pairs - **IS an electrophile** ✓ **(4) $SO_3H^+$ (protonated sulfur trioxide)** - Contains $S$ with positive character - Accepts electron pairs readily - **IS an electrophile** ✓ **Answer: (2) $CH_2=CH_2$** is NOT an electrophile because it contains electron-rich $\pi$ bonds and acts as a nucleophile instead. All others are electron-deficient species that accept electrons.