To classify these molecules based on whether the substituent group is ortho/para directing or meta directing for electrophilic aromatic substitution, you need to first identify the nature of the substituent group. Here's a step-by-step explanation:
1. Identify the substituent group on the aromatic ring.
2. Determine whether the substituent group is electron-donating or electron-withdrawing.
3. Classify the substituent group accordingly:
- Ortho/para directing: If the substituent group is electron-donating, it usually directs the incoming electrophile to the ortho or para position relative to itself. Common examples of ortho/para directing groups include -OH, -NH2, -OCH3, -CH3.
- Meta directing: If the substituent group is electron-withdrawing, it usually directs the incoming electrophile to the meta position relative to itself. Common examples of meta directing groups include -NO2, -CN, -COOH, -SO3H.
Once you have classified the substituent group, you can place it in the appropriate category (either ortho/para directing or meta directing) based on its directing properties.