Question

Which of the following is the strongest activating group in electrophilic aromatic substitution reactions?

• A. \( \text{-OCH}_3 \)
• B. \( \text{-N(CH}_3)_2 \)
• C. \( \text{-CO}_2\text{CH}_3 \)
• D. \( \text{-NO}_2 \)

Hint:

Strong activating groups promote faster electrophilic substitution reactions due to electron donation.

Answer 1

The Correct Option is B

The -N(CH\(_3\))\(_2\) (dimethylamino group) is the most potent electron-donating group, enhancing electrophilic substitution. This effect arises due to strong resonance and inductive donation, increasing electron density in the aromatic ring. Groups like -NO\(_2\) are electron-withdrawing, making substitution less favorable.