Question

What is the feature found in all ortho-para directing groups?

• A. An oxygen is directly attached to the aromatic ring
• B. The atom attached to the aromatic ring possess an unshared pair of electrons
• C. The group has ability to delocalize the positive charge of the arenium ions
• D. The atom directly attached to the aromatic ring is more electromagentic than carbon

Answer 1

Answer: (C)

The group has ability to delocalize the positive charge of the arenium ions

Ortho-para directing group increases electron density inside the ring so they stabilise arenium ion by delocalization of positive charge.