The correct arrangement for decreasing order of electrophilic substitution for the following compounds:

Step 1: Identify Groups and Their Effect

From the image, the four compounds are:

• (I) = Toluene: $\ce{-CH3}$ = activating, ortho/para director
• (II) = Anisole: $\ce{-OCH3}$ = strongly activating (lone pair donation), ortho/para director
• (III) = Chlorobenzene: $\ce{-Cl}$ = deactivating (inductive), but ortho/para director
• (IV) = Benzotrifluoride: $\ce{-CF3}$ = strongly deactivating (no lone pairs, strong inductive withdrawal), meta director

Step 2: Rank Reactivity Toward EAS

Higher electron density in ring = more reactive toward electrophile:

1. $\ce{-OCH3}$ (anisole): strongest activator
2. $\ce{-CH3}$ (toluene): moderate activator
3. $\ce{-Cl}$ (chlorobenzene): deactivating but less than $\ce{CF3}$
4. $\ce{-CF3}$ (benzotrifluoride): strongly deactivating

Order: $\text{III} > \text{I} > \text{II} > \text{IV}$

Answer: Option b