Question

The electron displacement effect observed in the given structures is known as:
 

 

• A. +R effect
• B. -R effect
• C. Electromeric effect
• D. -I effect

Hint:

The -R effect is observed when a substituent group withdraws electron density from the rest of the molecule through resonance. This effect stabilizes positive charges but destabilizes negative charges.

Answer 1

The Correct Option is B

In the given structure, the electron displacement observed is due to the withdrawal of electron density from the benzene ring to the substituent group, leading to a -R effect (resonance withdrawing effect). This effect reduces the electron density in the aromatic ring, making it more reactive toward electrophiles.