Final answer:
The compound CH₃CH₂OH is named ethanol according to IUPAC nomenclature, which is indicated by the two-carbon alkyl chain ('eth') and the hydroxyl group ('-anol'). The correct option is B.
Step-by-step explanation:
The IUPAC name for the compound CH₃CH₂OH is ethanol. This chemical compound is an alcohol with two carbons in its chain, signified by the prefix 'eth-,' and the presence of a hydroxyl group (-OH) indicated by the suffix '-anol.'
Therefore, the correct IUPAC name is ethanol, option b. Methanol, propanol, and butanol all have different numbers of carbon atoms and correspond to different chain lengths; methanol (CH₃OH) has one carbon, propanol (CH₃CH₂CH₂OH or C₃H₇OH) has three, and butanol (C₄H₉OH) has four.