See image — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

**Analysis of Electrophilic Character:** Electrophilic intermediates are species deficient in electrons that seek electron-rich sites (nucleophiles). **(1) Carbocation ($R_3C^+$):** Positively charged carbon with only 6 electrons in valence shell. Highly electrophilic as it actively attracts electron pairs. ✓ **(2) Carbanion ($R_3C^-$):** Negatively charged carbon with excess electrons. Nucleophilic in character, NOT electrophilic. ✗ **(3) Free radicals ($R_3C^\bullet$):** Neutral species with unpaired electron. Exhibits both nucleophilic and electrophilic character depending on context, but primarily act as nucleophiles in polar environments. NOT typically classified as electrophilic. ✗ **(4) Singlet carbenes ($R_2C:$):** Divalent carbon with two lone pairs. Although neutral, they are highly electrophilic because: - The empty p-orbital on carbon accepts electron pairs - They readily attack $\pi$ bonds and other electron-rich sites - Characteristic of electrophilic addition mechanisms ✓ **Answer: (C) (1) and (4)** Only carbocations and singlet carbenes are electrophilic intermediates.