Question

Question: Draw all possible resonance structures for the antihistamine diphenhydramine, the active ingredient in Benadryl.

Short answer

Answer

Resonating structures of diphenhydramine.

Step-by-step solution

Resonance structures

Some properties of an organic compound, that cannot be explained by a single structure are explained using multiple structures.

That differs only in the position of $\mathbf{\pi }$bond or nonbonding electrons are called resonance or canonical structures.

Resonance structures for diphenhydramine

Resonating structures are drawn by only moving the $\mathrm{\pi }$bonds (atoms or groups never change their position).

Resonance structures for diphenhydramine