The compound that is most difficult to protonate is:

Question

The compound that is most difficult to protonate is: (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Due to involvement of lone pair of electrons in resonance in phenol, it will have positive charge (partial), hence incoming proton will not be able to attack easily.

Q. The compound that is most difficult to protonate is:

Due to involvement of lone pair of electrons in resonance in phenol, it will have positive charge (partial), hence incoming proton will not be able to attack easily.