What classification of alcohol has one alkyl group attached to the carbon bonded to the hydroxyl?

In organic chemistry, alcohols are classified based on the number of alkyl groups attached to the carbon atom that is directly bonded to the hydroxyl group (-OH). In the context of the question, when a carbon is connected to only one alkyl group and is also bonded to the hydroxyl group, it is categorized as a primary (1º) alcohol.

A primary alcohol has the general structure that allows it to be classified as such because it contains one carbon group attached to the carbon that carries the -OH group. This means that the hydroxyl carbon is at the end of a carbon chain, which is typically what one observes for primary alcohols.

Consider tertiary alcohols, which would have three alkyl groups attached to the carbon bearing the hydroxyl group, or secondary alcohols, where two alkyl groups would be present. Aromatic alcohols, on the other hand, consist of a hydroxyl group bonded to an aromatic ring, which does not fit the description provided in the question. Therefore, the classification of alcohol described aligns correctly with the definition of a primary alcohol, making it the proper choice.