Which functional groups are found in diphenhydramine?

Ether and amine.

Explanation:

Diphenhydramine is a first generation antihistamine usually employed in the treatment of allergies. It is a drug of the ethanolamine group (ie it has two functional groups which are ether and amine) that has inhibitory activity on muscarinic, serotonergic and alpha adrenergic receptors. Its main adverse effect is sedation. Many patients treated with diphenhydramine have drowsiness. During treatment with diphenhydramine, it is not recommended to use other central nervous system depressants or to drink alcohol.

correct answer is a. and d.