The left column of text below provides a list of (sometimes older style) IUPAC or common nam compounds. On the right, letters of the alphabet designate an organic functional group.

M compound with the letter that best describes its main functional group by writing that letter the left of the compound name. 1-pentyne1°----- alcohol 2-pentyne1° amine 3,3-dichlorohexane----------2° alcehol 3,4-dichlorohexaned------- 2° amine 3-ethoxyheptane3°------ alcohol 3-hexan-2-ol------aldehyde 4-heptan-4-ol-------g -amide aniline--------aromatic hydrocarbon .butyl caproate------- carboxylic acid civetone-------- carboxylic acid anhydride dipropyl sulfide-----------k epoxide- ethanamide-------ester ethylene oxide---------ether (other than an epoxide)m. formic anhydride------geminal diol hexane-1,2-diolglycol N-ethyl-4-octanamine--------internal alkyne toluene--------ketone propanal--------terminal alkyne propanoic acid-----------thioether 20propanol-------vicinał diol