Question:

In the following series of reactions identify the major products A and B respectively.

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In electrophilic aromatic substitution reactions with multiple substituents, consider the directing effects of each group. Deactivating groups are generally meta directing, while activating and weakly deactivating groups (like halogens) are ortho-para directing. If the directing effects conflict, the stronger activating group usually dictates the regioselectivity. Steric hindrance can also play a role in determining the major product, especially in ortho substitution.