Sure! Let's break down which positions on each benzene ring will be the most reactive toward **electrophilic aromatic substitution (EAS)**. The reactivity and preferred positions depend on the substituent already attached to the ring. --- ## 1. Benzene ring with **CF₃** group (trifluoromethylbenzene) - **CF₃** is a **strong electron-withdrawing group** (due to the electronegative fluorines). - It **deactivates** the ring and **directs new substituents to the meta position**. - **Most reactive positions:** **meta** to CF₃. --- ## 2. Benzene ring with **COCH₃** group (acetophenone) - **COCH₃** (acetyl group) is also an **electron-withdrawing group**. - It **deactivates** the ring and **directs to the meta position** (like CF₃). - **Most reactive positions:** **meta** to COCH₃. --- ## 3. Benzene ring with **NH₂** group (aniline) - **NH₂** is a **strong electron-donating group**. - It **activates** the ring and **directs to the ortho and para positions**. - **Most reactive positions:** **ortho** and **para** to NH₂. --- ### **Summary Table** | Molecule | Substituent | Activating/Deactivating | Directs to: | Most Reactive Positions | |---------------------|-------------|------------------------|---------------------|-------------------------------| | Benzene-CF₃ | CF₃ | Deactivating | Meta | 3, 5 (meta to CF₃) | | Benzene-COCH₃ | COCH₃ | Deactivating | Meta | 3, 5 (meta to COCH₃) | | Benzene-NH₂ | NH₂ | Activating | Ortho, Para | 2, 4, 6 (ortho, para to NH₂) | --- ## **Visual Explanation** - For **CF₃** and **COCH₃**: Highlight the positions **meta** to the substituent. - For **NH₂**: Highlight the **ortho** and **para** positions relative to NH₂. --- ### **How to Identify the Positions:** - **Ortho** = positions **adjacent** to the substituent (1 away). - **Meta** = positions **one carbon further** than ortho (2 away). - **Para** = position **opposite** the substituent (3 away). --- Let me know if you'd like a diagram with the specific positions marked!