Multiple choice Urotropine can be obtained by which of the following reactions? Reaction between formaldehyde and ammonia Reaction between phenol and formaldehyde Reaction between vinyl acetylene and hydrochloric acid Reaction between benzaldehyde and triphenylphosphine alkylindenes Reaction between acetylene and chlorine Reveal answer Fill a bubble to check yourself A Correct answer Explanation This option is correct. When formaldehyde and ammonia react with each other, hexamethylene tetramine is formed. It is called as urotropine.