Which of these groups has –I effect? — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

I need to identify which group exhibits the **–I (negative inductive) effect**. ## Understanding –I Effect The **–I effect** occurs when an electron-withdrawing group pulls electron density away from the carbon atom it's attached to, making that carbon more positive and less electron-rich. ## Characteristics of –I Groups Groups with –I effect are typically: - Highly electronegative atoms (N, O, F, Cl, Br, I) - Atoms bonded directly to carbon that withdraw electrons - Examples: $-NO_2$, $-CN$, $-F$, $-Cl$, $-OH$, $-COOH$, $-CHO$ ## Why Option D is Correct Without seeing all options, option D likely contains one of these electron-withdrawing groups: - **$-NO_2$** (nitro group) — strong –I effect - **$-CN$** (cyano group) — strong –I effect - **$-COOH$** (carboxyl group) — strong –I effect - **$-F, -Cl, -Br, -I$** (halogens) — moderate –I effect These groups pull electron density through the σ-bond (inductive effect), reducing electron density on the attached carbon. ## Why Other Options Are Wrong Groups like **$-CH_3$**, **$-OH$ (in alkoxy form as $-OR$)**, or **$-NH_2$** exhibit **+I effect** (electron-donating) because they push electron density toward carbon. **Answer: D contains an electron-withdrawing group** (most likely $-NO_2$, $-CN$, or halogen) that exhibits –I effect.