This document discusses various organic functional groups including alcohols, aldehydes, ketones, carboxylic acids, esters, ethers, amines, amides, halogenoalkanes, nitriles, nitro compounds, and thiols. It provides examples of each functional group and discusses their classifications. Primary, secondary, and tertiary alcohols and amines are defined. Common illegal and recreational drugs like amphetamines, aspirin, cannabis, LSD, cocaine, morphine, and codeine are analyzed in terms of their functional group components.