Chemistry - Aromatic Hydrocarbon Question with Solution | TestHub

Question Explanation:

The question asks which of the given substituents is not an ortho/para directing group in electrophilic substitution of benzene.

Concept:

This question is based on electrophilic substitution and directive influence of substituents.

Solution:

–NH₂ and –OH are strong electron donating groups, activating the ring and directing substitution to

ortho/para positions. Halogens (–X) are deactivating but still ortho/para directing due to lone pair

resonance. The –CHO group (formyl) is strongly electron withdrawing, deactivates the ring, and directs substitution to the meta position.

Final Answer: The correct option is (D)