Which of the following reasons best explains why aromatic protons have a larger chemical shift than protons one carbon removed from a halogen?
A) An aromatic ring is more electron withdrawing than a halogen.
B) A halogen is more electron withdrawing than an aromatic ring.
C) Electron movement induces a magnetic field opposing the external field.
D) Electron movement induces a magnetic field reinforcing the external field.

Question

Quizplus · Accepted Answer

Aromatic protons experience a larger chemical shift because the circulating π-electrons in the aromatic ring create a magnetic field that reinforces the external magnetic field, deshielding the protons and shifting their resonance to a higher frequency.

Which of the Following Reasons Best Explains Why Aromatic Protons