The IUPAC name of the compound CH3 CH2 CH2 CH2 OH is butanol.
To explain further, we first identify the longest continuous carbon chain in the molecular structure. In this case, the longest chain consists of four carbon atoms, which gives it the prefix ‘but-‘. The presence of the –OH functional group classifies this compound as an alcohol, and since there is one –OH group, we use the suffix ‘-ol’. Therefore, combining these parts, we arrive at the name butanol.