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

Step-by-Step Solution Step 1: 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 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