What are the steps to determine the IUPAC name for 2-butanol?

To determine the correct IUPAC name, we follow these rules:

1. Identify the longest carbon chain containing the hydroxyl (-OH) group. The compound is a 4-carbon chain, so the parent alkane is butane. Since it's an alcohol, the base name will be butanol.

2. Number the carbon chain from the end that gives the hydroxyl group the lowest possible number. All the given options end in "-2-butanol", which means the hydroxyl group (-OH) is on the second carbon atom. This fixes the numbering of the main chain. Let's represent the chain as: $\text{C}_1-\text{C}_2-\text{C}_3-\text{C}_4$.